Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

Junos OS Release Notes for SRX Series


These release notes accompany Junos OS Release 18.4R3 for the SRX Series. They describe new and changed features, limitations, and known and resolved problems in the hardware and software.

You can also find these release notes on the Juniper Networks Junos OS Documentation webpage, located at


The SRX5K-SPC3 Services Processing Card was introduced in Junos OS Service Release 18.2R1-S1 and is supported in all subsequent Junos OS Releases. The features and functionalities of the SRX5K-SPC3 card are supported in Junos OS Release 18.4R1. Going forward, future improvements for SRX5K-SPC3 will be included in upcoming Junos OS Maintenance Releases.

New and Changed Features

This section describes the new features and enhancements to existing features in Junos OS Release 18.4R3 for the SRX Series devices.

Junos OS Release 18.4R3 supports the following Juniper Networks security platforms: vSRX, SRX300/320, SRX340/345, SRX550HM, SRX1500, SRX4100/4200, SRX4600, SRX5400, SRX5600, and SRX5800. Most security features in this release were previously delivered in Junos OS for SRX Series “X” releases from 12.1X44 through 15.1X49-D150. Security features delivered in Junos OS for SRX Series “X” releases after 15.1X49-D150 are not available in 18.4 releases.

Release 18.4R3 New and Changed Features

There are no new features in Junos OS Release 18.4R3 for the SRX Series devices.

Release 18.4R2-S1 New and Changed Features

Chassis Clustering

Release 18.4R2 New and Changed Features

There are no new features in Junos OS Release 18.4R2 for the SRX Series devices.

Release 18.4R1 New and Changed Features

Application Security

  • CLI enhancements to support J-Web (SRX Series and vSRX)—Starting in Junos OS Release 18.4R1, the show service application-identification command is enhanced to display applications and application group details in J-Web.

    The show service application-identification command used with the new entries option provides the following functionality:

    • Alphabetical list application and application group details.

    • Pagination support to limit the number of entries in output.

    • Display of details in a sorted order.

    • Using filters on output columns to search applications easily.

    [See show services application-identification entries.]

  • SSL decryption port mirroring (SRX Series and vSRX)—Junos OS Release 18.4R1 introduces SSL decryption mirroring for SSL forward and reverse proxy. SSL decryption mirroring enables you to forward a copy of SSL decrypted traffic to a configured mirror port on a server that is acting as a traffic collection tool.

    To use the decryption mirroring feature, configure the mirror interface and the MAC address of the port in the SSL proxy profile, and apply the SSL proxy profile as the application service in the security policy. Traffic matching the policy rule is decrypted, and a copy of SSL-decrypted traffic is forwarded to the configured mirror port.

    [See SSL Proxy.]

  • Application path selection based on link preference and priority (SRX300, SRX320, SRX340, SRX345, SRX550M, SRX1500, SRX4100 SRX4200, and vSRX)—Starting in Junos OS Release 18.4R1, you can configure Application Quality of Experience (AppQoE) to select an application path based on the link priority and the link type when multiple links are available.

    For application path selection, a list of paths to a specific destination, which meets SLA requirements, is made available. From the list, AppQoE selects a path that matches the configured link preference. Paths are WAN links used for forwarding application traffic. You can select an MPLS or Internet link as the preferred path, and assign a priority from the range 1-255 (value of 1 indicates highest priority).

    [See Application Quality of Experience.]

  • Schedulers support for APBR (SRX Series and vSRX)—Starting in Junos OS Release 18.4R1, support for configuring policy schedulers for an advanced policy-based routing (APBR) policy is available. Using a policy scheduler, you can schedule APBR policy execution at a specified time and enforce the policy for a specified duration.

    To use a scheduler for an APBR policy, you must create a scheduler and refer to scheduler in your APBR policy configuration. The policy scheduler activates and deactivates a policy according to the scheduled time. When the scheduler times out, the associated policy is deactivated.

    [See Advanced Policy-Based Routing.]

Chassis Cluster

  • Chassis cluster resiliency (SRX5400, SRX5600, and SRX5800)—Starting in Junos OS Release 18.4R1, a three-layered model is introduced to detect software and hardware failures that impact chassis cluster performance. Flapping of em0 and control path software or hardware failures are detected and state transitions and failovers are triggered using this model. Following are the three layers:

    • Layer 1 : Identifies and detects the components that are causing the failures.

    • Layer 2 : Detects the failures that are not detected by Layer1.

    • Layer 3 : Shares the health information of the system between the two nodes over control and fabric links.

    The set chassis cluster health-monitoring command is introduced to enable monitoring the health of chassis cluster.

    [See Chassis Cluster Resiliency.]

Flow-Based and Packet-Based Processing

  • SRX5K-SPC3 card with flow support in chassis cluster mode (SRX5400, SRX5600, and SRX5800)—Starting in Junos OS Release 18.4R1, the SRX5K-SPC3 and SRX5K-SPC-4-15-320 (SPC2) cards can operate together in a mixed-mode configuration on the SRX5000 line of devices using the same slot number in both nodes. If you are adding the SPC3 SPCs to the SRX5000 devices, you must install the new SPCs in the lowest-numbered slot of any SPC that provides central point functionality. SPC3 interoperates with the SRX5000 I/O cards (IOC2, IOC3), Switch Control Boards (SCB2, SCB3), Routing Engines, and SPC2 cards.

    [See Understanding Flow support on SRX5K-SPC3 Platforms.]

General Packet Radio Service (GPRS)

  • IPv6 support on GTP (SRX1500, SRX4100, SRX4200, SRX4600, SRX4800, SRX5400, SRX5600, SRX5800, and vSRX)—Starting in Junos OS Release 18.4R1, GPRS tunneling protocol (GTP) traffic security inspection is supported on IPv6 addresses along with existing IPv4 support. With this enhancement, a GTP tunnel using either IPv4 and IPv6 addresses is established for individual user endpoints (UEs) between a Serving GPRS Support Node (SGSN) in 3G or a Service Gateway (S-GW) and a Gateway GPRS Support Node (GGSN) in 3G or a PDN Gateway (P-GW) in 4G.

    [See GPRS Overview.]

  • Enhancements to GTP-C Tunnel (SRX5400, SRX5600, and SRX5800)—Starting in Junos OS Release 18.4R1, the GTP-C tunnel is enhanced to support tunnel-based session distribution to speed up the tunnel setup process and load-balance the sessions between the SPUs. The GTP-C tunnels and the GTP-C tunnel sessions are distributed by the SGSN tunnel endpoint identifier (TEID) of the tunnel. Use the set security forwarding-process application-services enable-gtpu-distribution command to enable the tunnel-based session distribution where the GTP-C traffic of different tunnels is spread across different SPUs.

    [See GPRS Overview.]

Interfaces and Chassis

  • Support for up and down delay timers on reth interfaces (SRX5400, SRX5600, and SRX5800)—Starting in Junos OS Release 18.4R1, you can configure up and down delay timers for redundant Ethernet (reth) interfaces. The delay timers keep the reth interfaces up or down, respectively, to prevent the routing protocols from reconverging and to avoid loss of traffic during a crash or when links flap.

    On SRX series devices, the default delay timer for down hold-time is 11 seconds, and the default delay timer for up hold-time is 0 seconds. To configure the timers, include the reth 1 hold-time down timer and reth 1 hold-time up timer statements at the [edit interfaces] hierarchy level.

    [See hold-time (Redundant Ethernet Interfaces)].

  • Half-duplex link support (SRX340 and SRX345)—Starting in Junos OS release 18.4R1, half-duplex mode is supported on SRX340 and SRX345 devices. Half duplex enables bidirectional communication, but signals can flow in only one direction at a time. Full-duplex communication means that both ends of the communication can send and receive signals at the same time. By default, half duplex is configured. If the link partner is set to autonegotiate the link, then the link is autonegotiated to full duplex or half duplex. If the link is not set to autonegotiation, then the link defaults to half duplex unless the interface is explicitly configured for full duplex.

    [See link-mode.]

Intrusion Detection and Protection (IDP)

  • Support for custom time bindings in a time-binding custom attack (SRX Series)—Starting in Junos OS Release 18.4R1, you can configure the maximum time interval between any two instances of a time-binding custom attack. The range for the maximum time interval is 0 minutes and 0 seconds through 60 minutes and 0 seconds. In Junos OS releases before 18.4R1, the maximum time interval between any two instances of a time-binding attack is 60 seconds.

    The interval time-interval statement is introduced at the [edit security idp custom-attack attack-name time-binding] hierarchy to configure a custom time-binding.

    [See Understanding Custom Attack Objects and time-binding.]

  • User visibility improvements for IDP attacks within an IDP Policy (SRX Series and vSRX)—Starting in Junos OS Release 18.4R1, you can view and validate the complete set of attacks that are configured for an IDP policy (predefined, dynamic, and custom attacks).

    Use the show security idp attack attack-list policy policy-name command to view the attacks that are configured for an IDP policy.

    [See show security idp attack attack-list policy.]

  • IDP policy rematch (SRX Series)—Starting in Junos OS Release 18.4R1, when a new IDP policy is loaded, the existing sessions are inspected using the newly loaded policy and are not ignored for IDP processing.

    [See IDP Policies Overview.]

Logical Systems and Tenant Systems

  • Starting in Junos OS Release 18.4R1, the following features that are supported on the logical systems are now extended to tenant systems:

    • Dynamic address support for tenant systems (SRX Series)—Starting in Junos OS Release 18.4R1, the tenant system user can create dynamic address entries within a tenant system. A dynamic address entry contains IP ranges extracted from external sources. The security policies use the dynamic address in the source-address or destination-address field. The tenant system administrator can view the dynamic address information, including name, feeds, properties, and number of IPv4 and IPv6 entries for tenant systems, by using the show security dynamic-address command.

      [See Security Policies for Tenant Systems.]

    • DHCP support for tenant systems (SRX Series)—Starting in Junos OS Release 18.4R1, DHCP provides support for DHCP clients, DHCP relay agents, and IPv6 dynamic servers for prefix delegation for tenant systems. The DHCP relay agent operates as the interface between DHCP clients and IPv6 dynamic server for tenant systems, and also relays DHCP messages between DHCP clients and DHCP servers on different IP address networks.

      [See DHCP for Tenant Systems.]

    • SRX5K-SPC3 card support for tenant systems (SRX5400, SRX5600, and SRX5800)—Starting in Junos OS Release 18.4R1, support for the SRX5K-SPC3 services processing card is introduced for tenant systems.

      [See Tenant Systems Overview.]

    • Application firewall support on tenant systems (SRX Series)—Starting in Junos OS Release 18.4R1, the tenant system administrator can configure the application firewall profile, trace options, and resources appfw-rule-set and appfw-rule in a tenant system. The application firewall rules can be reordered using the command insert tenants tenant-id security application-firewall rule-sets ruleset-name rule rule-name1 after rule rule-name2.

      Application firewall is a group of fine-grained application control policies to allow or deny the traffic based on the dynamic application name or the group names. It enhances security policy creation and enforcement based on the applications rather than traditional port and protocol analysis.

      [See Application Firewall Services for Tenant Systems.]

    • Interfaces support enhancement on tenant systems (SRX1500, SRX4100, SRX4200, SRX4600, SRX5400, SRX5600, and SRX5800)—Starting in Junos OS Release 18.4R1, support for interfaces is enhanced on tenants systems with the following changes:

      • You can configure an interface in the tenant system similar to how you configure an interface in a logical system.

      • All types of interfaces that can be configured in a logical system can also be configured in a tenant system.

      • All the interfaces that are configured in a tenant system are associated with the routing instance configured for that tenant system.

      [See Tenant Systems Overview.]

Network Management and Monitoring

  • RPM probe enhancement (SRX Series)—Starting in Junos OS Release 18.4R1, if the result of a probe or test exceeds the packet loss threshold, the real-time performance monitoring (RPM) test probe is marked as failed. The test probe also fails when the round-trip time (RTT) exceeds the configured threshold ranges from 0 through 60000000 ms. As a result, the device generates an SNMP notification (trap) and marks the RPM test as failed.

    RPM allows you to perform service-level monitoring. When RPM is configured on a device, the device calculates network performance based on packet response time, jitter, and packet loss.

    [See RPM Overview.]

  • SNMP support for monitoring the 4G LTE Mini-Physical Interface Module (Mini-PIM) status (SRX300, SRX320, SRX340, SRX345, and SRX550M)—Starting in Junos OS Release 18.4R1, you can monitor 4G LTE Mini-PIM status by using SNMP remote network management.

    You can use the following commands to monitor the 4G LTE Mini-PIM status:

    show snmp mib walk ascii jnxWirelessWANNetworkInfoTable

    show snmp mib walk ascii jnxWirelessWANFirmwareInfoTable

    In previous releases, the show modem wireless network interface interface-name and show modem wireless firmware interface interface-name commands are used to check the 4G LTE Mini-PIM status.

    [See Enterprise-Specific SNMP MIBs Supported by Junos OS.]

Routing Protocols

  • ARP policer support to protect Routing Engine (SRX Series)—Starting in Junos OS Release 18.4R1, you can apply policers on Address Resolution Protocol (ARP) traffic on SRX Series devices. You can configure rate limiting for the policer by specifying the bandwidth and the burst-size limit. Packets exceeding the policer limits are discarded.

    The traffic to the Routing Engine is controlled by applying the policer on ARP traffic. Using policers helps prevent network congestion caused by broadcast storms.

    [See ARP Policer Overview.]


  • New operational commands for security policy configuration (SRX Series and vSRX)—Starting in Junos OS Release 18.4R1, the following operational commands are introduced:

    • show security policies information

    • show security policies checksum

    • request security policies check

    • request security policies resync

    The show security policies information command provides detailed information about the policies configured on SRX Series devices and on vSRX. The show security policies checksum, request security policies check, and request security policies resync commands are used to synchronize security policies between the Routing Engine and the Packet Forwarding Engine.

    [See show security policies information, show security policies checksum, request security policies check, and request security policies resync.]

  • URL category-based security with unified policies (SRX Series)—Starting from Junos OS Release 18.4R1, the unified policies feature is enhanced to include URL categories as match criteria for traffic flowing through the firewall. The URL category for Web filtering enables redirecting the traffic based on configured URL Category policy for further processing on the SRX Series devices. URL categories can be configured for unified policies with or without dynamic-application applied.

    A URL category can be configured as url-category any and url-category none. If url-category is not configured, the functionality is similar to url-category none.

    [See Configuring Unified Security Policies.]

Juniper Sky Advanced Threat Prevention

  • Juniper Sky ATP Logical Domain Support—Starting in Junos OS 18.4, SRX Series devices support logical domains for anti-malware and security-intelligence policies. When you associate a logical domain with a realm in Juniper Sky ATP, that domain receives the threat management features configured for the realm. The SRX Series device will then perform policy enforcement based on logical domain and the associated Juniper Sky ATP realm. See Tenant Systems: Security-Intelligence and Anti-Malware Policies in the Juniper Sky Advanced Threat Prevention Administration Guide for details.

Software Licensing

  • Support to stop log messages on throughput overuse (SRX4100)—Starting with Junos OS Release 18.4R1, the enhanced performance upgrade license is required to stop the log messages that are generated if the Internet mix (IMIX) throughput exceeds 20 Gbps and 7 Mpps on the SRX4100 device.

    [See Log File Sample Content.]


  • Avira scan engine support on antivirus module (SRX1500, SRX4100, SRX4200, and SRX4600)—Starting in Junos OS Release 18.4R1, SRX Series devices support an on-device antivirus scan engine. The on-device scan engine Avira scans the data by accessing the virus pattern database. The antivirus scan engine is provided as a UTM module that you can download and install on your SRX Series device either manually (using the request security utm anti-virus avira-engine command) or by using the Internet to connect to a Juniper Networks-hosted URL or a user-hosted URL.

    [See On-Device Antivirus Scan Engine.]


  • Port-mirrored traffic support on an IPsec interface (SRX Series)—Starting in Junos OS Release 18.4R1, if the output X2 interface of a mirror filter is configured for an st0 interface to filter traffic that you want to analyze, the packet is duplicated and encrypted by the IPsec tunnel bound to the st0 interface. This enhancement supports SRX Series devices in sending traffic mirrored from a port on an IPsec tunnel.

    [See Monitoring X2 Traffic.]

  • PowerMode IPsec (SRX4100 and SRX4200)—Starting in Junos OS Release 18.4R1, PowerMode IPsec (PMI) is a new mode of operation that provides IPsec performance improvements using Vector Packet Processing (VPP) and Intel AES-NI instructions. PMI utilizes a small software block inside the Packet Forwarding Engine that bypasses flow processing and utilizes the AES-NI instruction set for optimized performance of IPsec processing.

    You can enable PMI processing by using the set security flow power-mode-ipsec command.

    The following features are supported with PMI:

    • Auto Discovery VPN (ADVPN)

    • Internet Key Exchange (IKE) functionality

    • AutoVPN

    • High availability

    • IPv6

    • Stateful firewall

    • st0 interface

    • Traffic selectors

    [See Understanding PowerMode IPsec.]

  • SRX5K-SPC-4-15-320 (SPC2) and SRX5K-SPC3 (SPC3) support for IPsec VPN (SRX5400, SRX5600, and SRX5800)—Starting in Junos OS Release 18.4R1, all IPsec VPN features that were previously supported only on SPC3 (model number: SRX5K-SPC3) are now supported on both SPC2 (model number: SRX5K-SPC-4-15-320) and SPC3 installed in the SRX5000 line of devices operating in chassis cluster mode or in standalone mode.

    [See Understanding VPN Support for Inserting Services Processing Cards.]

Changes in Behavior and Syntax

This section lists the changes in behavior of Junos OS features and changes in the syntax of Junos OS statements and commands from Junos OS Release 18.4R3 for the SRX Series.

Release 18.4R3 Changes in Behavior and Syntax

Authentication and Access Control

  • Enabling and disabling SSH login password or challenge-response authentication (SRX Series)—Starting in Junos OS Release 18.4R3, you can disable either the SSH login password or the challenge-response authentication at the [edit system services ssh] hierarchy level.

    In Junos OS releases earlier than Release 18.4R3, you can enable and disable both the SSH login password and the challenge-response authentication simultaneously at the [edit system services ssh] hierarchy level.

    [See Configuring SSH Service for Remote Access to the Router or Switch.]

  • SSH protocol version v1 option deprecated from CLI (SRX Series)—Starting in Junos OS Release 18.4R3, the nonsecure SSH protocol version v1 option is not available at the [edit system services ssh protocol-version] hierarchy level. The SSH protocol version v2 is the default option to remotely manage systems and applications. The deprecation of the SSH protocol version v1 enables Junos OS to be compatible with OpenSSH 7.4 and later versions.

    Junos OS Release 18.4R2 and earlier releases support the SSH protocol version v1 option to remotely manage systems and applications.

    [See protocol-version.]

Interfaces and Chassis

  • Change in output of show interfaces (SRX300, SRX320, SRX340, SRX345, SRX550M)—Starting in Junos OS Release 18.4R3, the output of the show interfaces command on the SRX300 line of devices and on the SRX550M no longer displays vlan as the value of the Physical interface field. On these devices, the value of the Physical interface field in the command output appears as irb instead of vlan.

Juniper Sky ATP

  • Dynamic address entries on SRX Series devices in chassis cluster mode—Starting in Junos OS Release 18.4R3, for SRX Series devices in chassis cluster mode, the dynamic address entry list is retained on the device even after the device is rebooted following a loss of connection to Juniper Sky Advanced Threat Prevention (ATP).

Unified Threat Management

  • Increase in the utm scale number (SRX1500, SRX4100, SRX4200, SRX4600, SRX4800, SRX5400, SRX5600, and SRX5800)—Starting with Junos OS Release 18.4R3, on SRX Series devices, UTM policies, profiles, MIME patterns, filename extensions, protocol commands, and custom messages, are increased up to 1500. Custom URL patterns and custom URL categories are increased up to 3000.

    [See Unified Threat Management overview.]


  • IKE gateway dynamic distinguished name (DN) attributes (SRX Series devices)—Starting in Junos OS Release 18.4R3, you can now configure only one dynamic distinguished name (DN) attribute among container-string and wildcard-string at [edit security ike gateway gateway_name dynamic distinguished-name] hierarchy. If you try configuring the second attribute after you configure the first attribute, the first attribute is replaced with the second attribute. Before your upgrade your device, you must remove one of the attributes if you have configured both the attributes.

    [See distinguished-name (Security) and Understanding IKE Identity Configuration.]

  • COS Forward Class name (SRX Series devices)—Starting in Junos OS Release 18.4R3, we have deprecated the CLI option fc-name (COS Forward Class name) in the new iked process that displays security associations (SAs) under show command show security ipsec sa.

    [See show security ipsec security-associations.]

Release 18.4R2 Changes in Behavior and Syntax

Application Security

  • Starting in Junos OS Release 18.4R2, the SSL decryption mirroring feature is supported on redundant Ethernet (reth) interface on SRX Series devices operating in a chassis cluster.

  • Starting in Junos OS Release 18.4R2, the format for setting up an automatic update of the application signature package is changed. Now you can use the YYYY-MM-DD.hh:mm format to configure the time for automatic download for application signatures. For example, following statement sets the start time as 10 AM on June 30, 2019:

    You can configure the automatic updates using the new format once you upgrade your previous Junos OS version to the supported Junos OS version (Junos OS Release 18.4R2).

Network Management and Monitoring

  • NSD Restart Failure Alarm (SRX Series)—Starting in Junos OS Release 18.4R2, a system alarm is triggered when the Network Security Process (NSD) is unable to restart due to the failure of one or more NSD subcomponents. The alarm logs about the NSD are saved in the messages log. The alarm is automatically cleared when NSD restarts successfully.

    The show chassis alarms and show system alarms commands are updated to display the following output when NSD is unable to restart - NSD fails to restart because subcomponents fail.

    [See Alarm Overview.]


  • Encryption algorithm (SRX Series)—Starting in Junos OS Release 18.4R2, when AES-GCM 128-bit or AES-GCM 256-bit encryption algorithms are configured in the IPsec proposal, it is not mandatory to configure AES-GCM encryption algorithm in the corresponding IKE proposal.

    [See IPsec VPN Configuration Overview and encryption-algorithm (Security IKE).]

Release 18.4R1-S2 Changes in Behavior and Syntax


  • Encryption algorithm (SRX Series)—Starting in Junos OS Release 18.4R1-S2, when AES-GCM 128-bit or AES-GCM 256-bit encryption algorithms are configured in the IPsec proposal, it is not mandatory to configure AES-GCM encryption algorithm in the corresponding IKE proposal.

    [See IPsec VPN Configuration Overview and encryption-algorithm (Security IKE).]

Release 18.4R1 Changes in Behavior and Syntax

Application Security

  • Changes to show security advance-policy-based-routing statistics command—Starting from Junos OS Release 18.4R1, the AppID Requested, Rule matches, and AppID cache hits options are deprecated in the show security advance-policy-based-routing statistics command.

    The new options App rule hit on cache hit, URL cat rule hit on cache hit, App rule hit midstream and URL cat rule hit midstream are included to provide the details as shown in Table 3:

    Table 3: show security advance-policy-based-routing statistics

    Field Name

    Field Description

    App rule hit on cache hit

    The number of times the rule with a matching entry in the application system cache (ASC) is found.

    URL cat rule hit on cache hit

    The number of times the rule with defined URL categories is matched.

    App rule hit midstream

    The number of times a route is changed in the middle of a session because of the rule with defined application is matched.

    URL cat rule hit midstream

    The number of times a route is changed in the middle of a session because of the rule with defined URL categories is matched.

    The modified show security advance-policy-based-routing statistics command provides the output as shown in the following sample:

    user@host> show security advance-policy-based-routing statistics

Chassis Cluster

  • Chassis cluster information detail operational command (SRX Series)—Starting in Junos OS Release 18.4R1, use the show chassis cluster information detail command to view the chassis cluster information details for each node.

    [See show chassis cluster information.]

Flow-Based and Packet-Based Processing

  • New configuration options for flow configuration—Starting from Junos OS 18.4R1, the log dropped-illegal-packet and log dropped-icmp-packet options are introduced under the [edit security flow] hierarchy-level.

    [See flow (Security Flow).]

  • Multiple collector support for J-Flow version 9 (SRX Series)—Starting in Junos OS Release 18.4R1, for J-Flow version 9, up to four collectors can be configured under family inet and the PFE to export the flow record, flow record template, option data, and option data template packet to all configured collectors. Earlier to this release, only one collector could be configured under family inet and inet6.

Installation and Upgrade

  • Autoinstallation support (SRX1500)—Starting in Junos OS Release 18.4R1, SRX1500 devices support autoinstallation to automate the configuration process for loading configuration files onto new or existing devices automatically over the network. Use the CLI Editor in configuration mode to configure the device for autoinstallation. The factory-default setting has been changed to support autoinstallation.

    [See Configuring Autoinstallation on an SRX1500 Device.]

Network Management and Monitoring

  • The NETCONF server omits warnings in RPC replies when the rfc-compliant statement is configured and the operation returns <ok/> (SRX Series)—Starting in Junos OS Release 18.4R1, when you configure the rfc-compliant statement at the [edit system services netconf] hierarchy level to enforce certain behaviors by the NETCONF server, the server must not return an RPC reply that encloses both an <rpc-error> element and an <ok/> element. If the operation is successful, but the server reply would enclose one or more <rpc-error> elements of severity warning in addition to the <ok/> element, then the warnings are omitted. In earlier releases, or when the rfc-compliant statement is not configured, the NETCONF server might issue an RPC reply that encloses both an <rpc-error> element of severity warning and an <ok/> element.

  • SSHD process authentication logs timestamp (SRX Series)—Starting in Junos OS Release 18.4R1, the SSHD process authentication logs use only the time zone defined in the system time zone. In the earlier releases, the SSHD process authentication logs sometimes used the system time zone and the UTC time zone.

    [See Overview of Junos OS System Log Messages.]


  • security log message enhancement [SRX Series and vSRX]— Starting in Junos OS Release 18.4R1, the security log information is enhanced to include source zone and destination zone for Web filtering, content filtering, antispam filtering, and antivirus features of UTM.

    [See Understanding Unified Policies [Unified Threat Management (UTM)].]

  • UTM default policy enhancement (SRX1500, vSRX)—Starting with Junos OS Release 18.4R1, on SRX1500 Services Gateways and vSRX instances, UTM policies, profiles, MIME patterns, filename extensions, customer message, and protocol-command numbers of values are increased from 500 to 1500. The custom URL patterns and custom URL category values are increased from 1000 to 3000.

    [See UTM Overview.]

  • Antivirus profiles enhancement (SRX Series)— Starting in Junos OS Release 18.4R1, you can create a common antivirus profile for different antivirus types. While you are creating a UTM policy for an antivirus profile, the UTM policy configuration page provides common antivirus profile selection fields for each supported protocol.

    In Junos OS Release 18.3R1 and earlier releases, separate antivirus profiles are created for every antivirus protocol. While you are creating a UTM policy for an antivirus profile, the UTM policy configuration page provides separate antivirus profile selection fields for every supported protocol.

    [See Full Antivirus Protection.]

Known Behavior

This section contains the known behaviors, system maximums, and limitations in hardware and software in Junos OS Release 18.4R3 for the SRX Series.

For the most complete and latest information about known Junos OS defects, use the Juniper Networks online Junos Problem Report Search application.

Flow-Based and Packet-Based Processing

  • When you configure an interface to a zone under a tenant or under a root system, interfaces that are rented by other tenants are listed with a question mark. PR1370255

Interfaces and Chassis

  • On SRX4600 devices, the USB storage device is available only for the host OS (Linux) with full access and for the boot process (install and recovery functions). PR1283618


  • CLI terminal is not working in Java version 1.8 due to a security restriction in the running applet. PR1341956

Platform and Infrastructure

  • USB stops working if the USB is removed while it is in initialization state. To avoid this issue, wait for a few seconds before removing the USB. PR1332360

Unified Threat Management (UTM)

  • From Junos OS Release 18.3 onward, categories in the APBR module based on destination IP address are supported. Category classification occurs and the APBR action takes place. UTM Web filtering provides information about the category to the APBR module for the matched and received destination IP address. But currently there is a limitation from web filtering, which states that category classification is inaccurate for IP address and leads to non-APBR route. PR1365931

  • To make the APBR custom category work, you need to create a local UTM profile. PR1366528


  • When multiple traffic selectors are configured on a particular VPN, the iked process checks for a maximum of 1 DPD probe that is sent to the peer for the configured DPD interval. The DPD probe will be sent to the peer if traffic flows over even one of the tunnels for the given VPN object. PR1366585

  • On an existing tunnel, if the DPD values are changed, then they are not applied until rekeying for that tunnel happens. PR1375963

  • When using the operational mode request security ike debug-enable for IKE debugging after having used IKE traceoptions with a filename specified in the configuration, the debugs are still being written to the same filename. PR1381328

Known Issues

This section lists the known issues in hardware and software in Junos OS Release 18.4R3 for SRX Series devices.

For the most complete and latest information about known Junos OS defects, use the Juniper Networks online Junos Problem Report Search application.

Chassis Cluster

  • After sub-sequential reboot of the RG0, the primary tunnel entries are getting deleted. PR1396513

  • On SRX5400, SRX5600, and SRX5800 devices, during in-service software upgrade (ISSU), the IPsec tunnels flap, causing a disruption of traffic. The IPsec tunnels recover automatically after the ISSU process is completed. PR1416334

Class of Service (CoS)

  • On NFX Series platforms, when a CoS rewrite rule is configured for the st0 interface, the CoS value will not take effect on the corresponding forwarding class. It causes CoS not to work as expected. PR1439401

Flow-Based and Packet-Based Processing

  • On SRX Series devices, traffic identification might fail and unidentified traffic might pass through the device when the AppID feature is used. PR1357093

  • Invalid sessions timeout over 48 hours with stress TCP in the backup node. PR1383139

  • On all SRX Series platforms, in chassis cluster with Z mode traffic and local (non-reth) interfaces configured, when using ECMP routing between multiple interfaces residing on both node0 and node1, if a session is initiated through one node and the return traffic comes in through the other node, packets may get dropped due to reroute failure. PR1410233

  • While PMI is on, IPsec-encrypted statistics on the Routing Engine show security ipsec statistics are not working anymore for fragment packets. PR1411486

  • Within an SSL-proxy configuration, if trusted-ca and root-ca have the same name, then it will result in the associated SSL-T and I profiles not getting pushed to the Packet Forwarding Engine and thereby impacting the SSL-proxy functionality. As a workaround, ensure to have different IDs or names for trusted-ca and root-ca.

    If already in the scenario, do the following to recover:

    1. Configure different name for trusted-ca and root-ca.

    2. From the CLI, restart the NSD process using the restart network-security command.


  • The rtlogd process on the two Routing Engine HA nodes go into deadlock state when rtlogd on both nodes are busy sending data to each other in the single thread context. PR1435352

  • On SRX Series devices with SSL proxy service used, a memory leak issue might occur, which results in the flowd or srxpfe process stops. PR1450829

  • TCP session cannot time out properly upon receiving the TCP RESET packet, and the session timeout does not change to two second. PR1467654

Interfaces and Chassis

  • On SRX Series devices, when doing an ISSU upgrade, the reth interface might flap and cause traffic loss in rare occasions. PR1381475

  • On SRX Series platforms, sometimes the mgd processes are not properly closed. As a result, many mgd instances are unnecessarily left running. PR1439440

Intrusion Detection and Prevention (IDP)

  • Rogue .gz files in /var/tmp/sec-download/ might fail offline secpack update. PR1466283


  • On SRX Series platforms, the root password configured at the first J-Web access (Skip to J-Web) does not work if the password length is shorter than eight characters. PR1371353

  • Support for intelligent CLI-based autocomplete is added to secure-wire. PR1372825

  • On the SRX300 line of devices, an IPS installation failure message is displayed when the uploading IPS signature package using the TAP mode quick setup wizard. This is an intermittent issue and occurs when IPS is installed immediately after the system zeroized command. PR1404296

Network Management and Monitoring

  • The snmpd process leaks memory in the SNMPv3 query path and crashes. The issue is caused by a memory leak when the request PDU is dropped by SNMP when the snmp filter-duplicates configuration is enabled. Each request PDU has a structure pointer for the SNMPv3 security details. This is allocated when the PDU is created or cloned. But while dropping the duplicate requests, the corresponding structure is not freed, which causes the memory leak. PR1392616

Platform and Infrastructure

  • Multiple Monitor-failures errors are seen on the rg1 interface after ISSU completion from Junos OS Release 17.4R1-S3 to Junos OS Release 18.1R1.9. PR1354395

  • On an SRX4600 device, Packet Forwarding Engine stops are seen due to the segmentation problem. PR1422466

  • On the SRX300 line of devices, the interface LED does not work properly. PR1446035

Routing Policy and Firewall Filters

  • On all SRX Series devices, there might be a traffic outage if failover happens between node0 and node1 and the network security process (NSD) fails to read the security policies from the configuration file. PR1182591

  • In rare case, a specific domain is not resolved by the SRX Series devices when using the DNS address book. This is because the DNS library resolver fails to identify the pointer with a big offset in the compressed DNS name. PR1471408

Unified Threat Management (UTM)

  • From Junos OS Release 18.4 onwards, the UTM log will include source and destination zone information. PR1326271


  • On SRX Series devices, if multiple traffic selectors are configured for a peer with IKEv2 reauthentication, only one traffic selector is rekeyed at the time of IKEv2 reauthentication. The VPN tunnels of the remaining traffic selectors are cleared without immediate rekeying. New negotiation of these traffic selectors is triggered through other mechanisms such as traffic or by peer. PR1287168

  • On an SRX4600 device, when the next hop is set to the st0 interface, the output of the show route forwarding-table command displays the next-hop IP address twice. PR1290725

  • On SRX Series devices, with NCP as client, sometimes IKE SA might not be displayed in the CLI output after RG1 failover. PR1352457

  • VPN tunnels flap after adding or deleting a group in edit private mode on a clustered setup. PR1390831

  • On SRX5400, SRX5600, and SRX5800 devices with an SPC3 card, if an existing IKE gateway configuration is changed from AutoVPN to Site-to-Site VPN, the IKE negotiation behavior remains in responder-only mode. PR1413619

  • On SRX5400, SRX5600, and SRX5800 devices, during in-service software upgrade (ISSU), the IPsec tunnels flap, causing a disruption of traffic. The IPsec tunnels recover automatically after the ISSU process is completed. PR1416334

  • On the SRX5000 line of devices with SPC3 cards, sometimes IKE SA is not seen on the device when st0 binding on VPN configuration object is changed from one interface to another (for example, st0.x to st0.y). PR1441411

  • On SRX Series devices with more than 500 IPsec VPN tunnels configured, the IPsec VPN might flap if establishing a connection for the first time. PR1455951

  • On SRX Series devices with chassis cluster configured, when the SRX Series device is acting as a hub device and AutoVPN point-to-multipoint mode is configured (set interfaces st0 unit x multipoint and set security ike gateway xxx dynamic are configured), IPsec tunnels might lose connectivity after RG0 failover. PR1469172

Resolved Issues

This section lists the issues fixed in hardware and software in Junos OS Release 18.4R3 for SRX Series devices.

For the most complete and latest information about known Junos OS defects, use the Juniper Networks online Junos Problem Report Search application.

Resolved Issues: 18.4R3

Application Layer Gateways (ALGs)

  • Sometimes unexpected forwarding sessions appear for tenant ALG SIP traffic in cross tenant. PR1409748

  • The H.323 connection might not be established when the H.323 packet passes SRX Series devices twice through different virtual routers. PR1436449

  • Packet loss happens during cold synchronization from the secondary node after rebooting. PR1448252

Authentication and Access Control

  • The CPU utilization of the uacd is high, about 100 percent, in the output of show chassis routing-engine. PR1424971

  • The same source IP sessions are cleared when the IP entry is removed from the UAC table. PR1457570

Application Security

  • The AAMW diagnostic script gives incorrect error : Error: Platform does not support SkyATP: srx300. PR1423378

  • If automatic application-identification download is configured with a start-time specified, the automatic download stops when the time has progressed to the next year and a reboot is done before the start-time is reached that year. PR1436265

  • The flowd or srxpfe process might crash when advanced anti-malware service is used. PR1437270

  • The flowd process core files might be seen when the traffic hits an AppQoS policy. PR1446080

Chassis CLustering

  • Hardware failure is seen on both nodes in show chassis cluster status. PR1452137

  • On SRX Series devices with chassis cluster, the control link remains up even though the control link is actually down. PR1452488

Class of Service (CoS)

  • Frequent use of the show class-of-service spu statistics command cause rtlogd busy. PR1438747

Flow-Based and Packet-Based Processing

  • Throughput or latency performance of all traffic drops when TCP traffic is passing through from one logical system to another logical system. But it may occurs also when logical system is not used on SRX. PR1403727

  • Juniper Sky ATP does not escape the \ inside the username before the metadata is sent to the cloud. PR1416093

  • The flowd process stops on the SRX5000 or SRX4000 lines of devices when large-size packets go through IPsec tunnel with the post-fragment check. PR1417219

  • Blacklist compilation failures are reported. PR1418980

  • Group VPN IKE security associations cannot be established before RG0 failover. PR1419341

  • SSL proxy did not correctly warn users about unsupported certificates. PR1419485

  • SPC3 storage and hard disc error log messages. PR1420800

  • FRU model number is not displayed. PR1422185

  • Failed to clear sessions on SPC2 with error message error: usp_ipc_client_recv_:ipc_pipe_read() failed read timed out after 5 second(s). PR1426090

  • When configuring a GRE tunnel (GRE-over-IPsec-tunnel) or an IPsec tunnel on an SRX Series device, the MTU of the tunnel interface is calculated incorrectly. PR1426607

  • The X2 traffic cannot be encrypted after the traffic is decrypted when PMI is enabled. PR1429473

  • The flowd process might stop on the SRX5000 line of devices. PR1430804

  • VPN traffic fails after primary node reboot or power off. PR1433336

  • Intermittent packet drop might be observed if IPsec is configured. PR1434757

  • On SRX Series, syslog severity level of msg subtype is end of policy is set to error although this message can be ignored. PR1435233

  • On an SRX4600 device, core file generation might be observed and SPM might be in present state. PR1436421

  • The second IPsec ESP tunnel might not be able to establish between two IPv6 IKE peers. PR1435687

  • The ipfd process might crash when SecIntel is used. PR1436455

  • Some webpages cannot be fully rendered. PR1436813

  • When running SSL proxy on the firewall, the locally generated certificate is not validated by OpenSSL client. PR1436831

  • Member of dynamically created VLANs information is not displayed by show vlans command. PR1438153

  • The probe of Ethernet switching always shows down in a chassis cluster scenario. PR1438277

  • The flowd process stops and generates core files. PR1438445

  • Security logs cannot be sent to the external syslog server through TCP. PR1438834

  • The local interface IPv6 address might be shown as Tentative if LACP is enabled on the reth interface. PR1438887

  • When llmd is rotating database, there is possibility that reading a NULL db at the same time, which generates core files. PR1439186

  • The wmic process might stop and restart when using user firewall with Active Directory. PR1439538

  • The IKE pass-through packet might be dropped after source NATed. PR1440605

  • The flowd process stops on the SRX550 or on the SRX300 line of devices when an SFP transceiver is plugged in. PR1440194

  • While checking the flow session XML for source NAT under a tenant, there is no value identifier for tenant-name (< tenant>< /tenant>). PR1440652

  • Performance improvements were made to Screens, which benefit multi-socket systems. PR1440677

  • SPC2 wrongly forwarded packet to SPC3 core0 and core14. PR1441234

  • New CLI option to show only userful group information for an Active Directory user. PR1442567

  • Core files are generated while using NAT PBA in AA mode. PR1443148

  • On the SRX300 line of devices does not have MIB that can retrieve the fan status. PR1443649

  • The flowd or srxpfe process might crash when processing fragmented packets. PR1443868

  • Junos OS: SRX5000 Series: flowd process crash due to receipt of specific TCP packet (CVE-2019-0064) PR1445480

  • The flowd process might stop on SRX Series devices with chassis cluster and IRB interface is configured. PR1446833

  • The J-Flow version 5 stops working after changing input rate value. PR1446996

  • Packet loss happens during cold sync from the secondary node after rebooting. PR1447122

  • SPC3 Talus FPGA stuck on 0x3D or 0x69 golden version. PR1448722

  • Host-inbound or host-outbound traffic on VR does not work when SRX5000 line of devices work at SPC3 mix mode. PR1449059

  • All ingress packets are dropped if the traffic transit network is also the same network for LTE mPIM internal management. PR1450046

  • AAWM policy rules for IMAP traffic sometimes might not get applied when passed through an SRX Series device. PR1450904

  • FTP data cannot pass through SRX320 4G wireless from FTP server to client. PR1451122

  • Traffic forwarding on Q-in-Q port and VLAN tagging are not observed properly on R0. PR1451474

  • The rpd process might stop and restart and an rpd core file is generated when committing the configuration. PR1451860

  • Update SRX300 traffic default logging to stream mode. PR1453074

  • The security flow traceoptions fills in with RTSP ALG-related information. PR1458578

  • Optimizations were made to improve the connections-per-second performance of an SPC3. PR1458727

  • The tunnel packets might be dropped because gr0.0 or st0.0 interface is wrongly calculated after a GRE or VPN route change. PR1462825

  • Fragmented traffic might get looped between the fab interface in Z mode. PR1465100

  • The rpd process might stop after several changes to the flow-spec routes. PR1467838

  • Server unreachable is detected; ensure that port 443 is reachable. PR1468114

  • Tail drop on all ports is observed when any switch-side egress port gets congested. PR1468430

  • LTE latest 17.5.515 build drops FTP data connection. PR1468570

  • SRX300, SRX320, SRX340, SRX345, SRX550, and SRX550HM devices may not retrieve the complete users or groups and user-group-mappings if the DC includes more than 20,000 users or groups. Use JIMS solution on SRX300, SRX320, SRX340, SRX345, SRX550, and SRX550HM devices when the users or devices or groups are more than 20,000 in the AD deployment. PR1472601

Install and Upgrade

  • IDP install fails on one node because AppID process gets stuck. PR1336145

  • SRX Series devices go into DB mode after USB installation. PR1390577

  • SPMC version mismatch errors after Junos OS install using USB method. PR1437065

  • Junos OS upgrade fails when partition option is used on SRX Series devices. PR1449728

  • The jbuf process usage may increase up to 99 percent after Junos OS upgrade. PR1467351

Interfaces and Chassis

  • Both nodes in the SRX Series chassis cluster go into DB mode after downgrading to Junos OS Release 18.1. PR1407295

  • MTU change after a CFM session is up can impact L2 Ethernet ping (loopback messages). If the new change is less than the value in the initial incarnation, then L2 Ethernet ping would fail. PR1427589

  • LFM remote loopback is not working as expected. PR1428780

  • The LACP interface might flap if performing a failover. PR1429712

  • Certain interfaces may drop all unicast traffic when LTE PIM is used. PR1430403

  • The fxp0 interface might redirect packets not destined to itself. PR1453154

Intrusion Detection and Prevention (IDP)

  • The flowd or srxpfe process stops and generates core files when processing IDP packets. PR1416275

  • NSD fails to push security zone to the Packet Forwarding Engine after reboot, if there is an active IDP rule configured with FQDN. PR1420787

  • The flowd or srxpfe process stops and generates core files. PR1437569


  • Some error messages might be seen when using J-Web. PR1446081

  • The idle-timeout for J-Web access doesn't work properly. PR1446990

  • J-Web fails to display the traffic log in event mode when stream mode host is configured. PR1448541

  • Editing a destination NAT rule in J-Web introduces a non-configured routing instance field. PR1461599

Layer 2 Ethernet Services

  • DHCP request might get dropped in a DHCP relay scenario. PR1435039

Network Address Translation (NAT)

  • The nsd process might crash during SNMP query for deterministic NAT pool information. PR1436775

  • RTSP resource session is not found during NAT64 static mapping. PR1443222

  • On SRX5000 line of devices with SPC3 card, when using source NAT, under high traffic load, a small fraction of TCP-SYN packets may be dropped due to the source NAT port failing to be allocated. Also, the NAT pool resources may leak over time. PR1443345

  • A port endian issue in SPU messages between SPC3 and SPC2 results in one redundant NAT binding being created in the central point when one binding is allocated in SPC2 SPC. PR1450929

  • Packet loss is observed when multiple source NAT pools and rules are configured. PR1457904

Network Management and Monitoring

  • MIB OID dot3StatsDuplexStatus shows wrong status. PR1409979

  • SNMPD might generate core files after restarting the NSD process by restart network-security gracefully. PR1443675

  • Control links are logically down on SRX Series chassis cluster when software version is Junos OS Release 12.3X48. PR1458314

Platform and Infrastructure

  • The show security flow session command fails with error messages when SRX4600 has over a million routing entries. PR1408172

  • Packet drops, replication failure, or ksyncd crashes might be seen on the logical system of a Junos OS device after Routing Engine switchover. PR1427842

  • The PICs might go offline and split-brain might be seen when an interrupt storm happens on the internal Ethernet interface em0 or em1. PR1429181

  • Packet loss is caused by FPGA back pressure on SPC3. PR1429899

  • REST API does not work properly. PR1430187

  • Packet Forwarding Engine pause might be seen on the SRX1500 device. PR1431380

  • The false license alarm may be seen even if there is a valid license. PR1431609

  • When changing the decrypt mirror interface in the SSL proxy service configuration, it does not reflect properly in the Packet Forwarding Engine. PR1434595

  • The interface using LACP flaps when the Routing Engine is busy. PR1435955

  • LACP traffic is distributed evenly on ingress child links but not on egress links. PR1437098

  • The ksyncd process might crash and restart on SRX Series devices. PR1440576

  • The configured RPM probe server hardware timestamp does not respond with the correct timestamp to the RPM client. PR1441743

  • The RPM udp-ping probe does not work in a multiple routing instance scenario. PR1442157

  • The show security flow session command fails, generating an error message, when an SRX4100 or SRX4200 has around 1 million routing entries in the FIB. PR1445791

  • LACP cannot work with the encapsulation flexible-ethernet-services configuration PR1448161

  • Cm errors on certain MPC line cards are classified as major, which should be minor or non-fatal. PR1449427

  • REST API process become nonresponsive when a number of requests come at a high rate. PR1449987

  • Traffic loss might occur when there are around 80,000 routes in FIB. PR1450545

  • The SRX Series devices stops and generates several core files. PR1455169

  • When you try to reset the system configuration on an SRX1500 device using the reset config button, it does not work properly. PR1458323

  • The AAMWD process exceeds 85 percent RLIMIT_DATA limitation due to memory leak. PR1460619

  • A VM core might be observed if configuring a sampling rate of more than 65,535. PR1461487

  • The AE interface cannot be configured on an SRX4600 device. PR1465159

  • Static route through dl0.0 interface is not active. PR1465199

  • On SRX300 line of devices, you might encounter Authentication-Table loading slowly while using user-identification. PR1462922

Routing Policy and Firewall Filters

  • The NSD process might stop due to a memory corruption issue. PR1419983

  • An SRX1500 device allows only a maximum of 256 policies with counting enabled. PR1435231

  • Two ipfd processes appear in ps command and the process pauses. PR1444472

  • Traffic log shows a wrong custom-application name when the alg ignore option is used in application configuration. PR1457029

  • The NSD process might get stuck and cause problems. PR1458639

  • Policy detail does not display policy statistics counter, even if policy count is enabled. PR1471621

Routing Protocols

  • SSH login might fail if a user account exists in both local database and RADIUS or TACACS+. PR1454177

Services Applications

  • The flowd process stops when SRX5800 devices work at SPC3 mix mode with 1 SPC3 card and 7 SPC2 cards. PR1448395

  • In a rare condition, SRX device Packet Forwarding Engine might generate core file because corrupted or malformed HTTP long (over 64,000 bytes) messages hit security policy that is attached on ICAP redirect policy. PR1460035

Unified Threat Management (UTM)

  • The command show security utm web-filtering status now provides additional context when the status of EWF is down. PR1426748

  • Adjust core allocation ratio for on-box antivirus. PR1431780

  • On SRX Series devices, memory might leak if Websense Redirect Web Filtering is configured. PR1445222

  • Increase the scale number of UTM profile or policy for the SRX1500 device, and the SRX4000 and SRX5000 lines of devices. PR1455321


  • With a large number of IPsec tunnels established, a few tunnels might fail during rekey negotiation if the SRX Series device initiates the rekey. PR1389607

  • IPsec VPN missing half of the IKE SA and IPsec SA showing incorrect port number when scaling to 1000 IKEv1 AutoVPN tunnels. PR1399147

  • The IKE and IPsec configuration under groups is not supported. PR1405840

  • On SRX5400, SRX5600, and SRX5800 devices with SPC3, when the SRX Series device is configured in IKEv1 and NAT traversal is active, after a successful IPsec rekey, the IPsec tunnel index might change. In such a scenario, there might be some traffic loss for a few seconds. PR1409855

  • The IKED process stop due to a misconfiguration. PR1416081

  • The IKED process might stop when IKE and IPsec SA rekey happens simultaneously. PR1420762

  • The VPN tunnel might flap when IKE and IPsec rekey happen simultaneously PR1421905

  • Old tunnel entries are also seen when a new tunnel negotiation happens from the peer device after a change in the IKE gateway configuration at peer side. PR1423821

  • IPsec packet throughput might be impacted if NAT-T is configured and the fragmentation operation of post fragment happens. PR1424937

  • The P1 configuration delete message is not sent on loading the baseline configuration if there has been a prior change in VPN configuration. PR1432434

  • On the SRX5000 line of devices with SPC3, with P2MP and IKEv1 configured, if negotiation fails on the peer device, then multiple IPsec SA entries are created on the device if the peer keeps triggering a new negotiation. PR1432852

  • IPsec rekey triggers for when sequence number in AH and ESP packet is about to exhaust is not working. PR1433343

  • The kmd log shows resource temporarily unavailable repeatedly and VPNs might be down. PR1434137

  • On SRX Series devices, fragments exit VPN traffic earlier than required by ingress packet sizes. PR1435700

  • The IKED stops on the SRX5000 line of devices with SPC3 when IPsec VPN or IKE is configured. PR1443560

  • IPsec VPN traffic drop might be seen on SRX Series platforms with NAT-T scenario. PR1444730

  • IPsec tunnels with distribution profile configuration will be renegotiated after perform RG0 failover on the SRX5000 line of devices with SPC3. PR1446078

  • After a long time (a few hours) of traffic during a mini PDT test, the number of IPsec tunnels is much higher than expected. PR1449296

  • Some IPsec tunnels flap after RGs fail over on the SRX5000 line of devices. PR1450217

  • The VPN flaps on the primary node after a reboot of the secondary node. PR1455389

  • IPsec VPN tunnels are losing routes for the traffic selector randomly while the tunnel is still up, causing complete outage. PR1456301

  • Traffic is not sent out through an IPsec VPN after update to Junos OS Release 18.2 or later. PR1461793

  • The IPsec VPN tunnels cannot be established if overlapped subnets are configured in traffic selectors. PR1463880

Resolved Issues: 18.4R2

Application Firewall

  • Fail to match permit rule in AppFW rule set. PR1404161

Application Layer Gateways (ALGs)

  • DNS requests with the EDNS option might be dropped by the DNS ALG. PR1379433

  • On all SRX Series platforms, SIP/FTP ALG does not work when SIP traffic with source NAT goes through the SRX Series devices. PR1398377

  • H.323 voice packets might be dropped on SRX Series devices. PR1400630

  • The TCP reset packet is dropped when any TCP proxy based feature and the rst-invalidate-session command are enabled simultaneously. PR1430685

Chassis Clustering

  • The SNMP trap sends wrong information with Manual failover. PR1378903

  • Traffic cannot pass through cross tenants after ISSU from Junos OS Release 18.3 to Junos OS Release 18.4. PR1382467

  • Traffic with domain name address might fail for 3-5 minutes after RG0 failover on SRX Series platforms. PR1401925

  • The flowd process stops when updating or deleting a GTP tunnel. PR1404317

  • Mixed mode (SPC3 coexisting with SPC2 cards) high availability (HA) IP monitoring fails on secondary node with secondary arp entry not found error. PR1407056

  • The SRX Series devices might be potentially overwritten with an incorrect buffer address when detailed logging is configured under the GTPv2 profile. PR1413718

  • Starting with Junos OS Release 18.4, at most, 6 Packet Data Network Gateway (PGW) connections can be contained in a PDP context response; otherwise, the response will be dropped. PR1422877

  • Memory leaks might be seen on the jsqlsyncd process on SRX chassis clusters. PR1424884

  • RG0 failover sometimes causes FPC offline/present status. PR1428312

Flow-Based and Packet-Based Processing

  • On SRX1500 devices, fan speed goes up and down continuously. PR1335523

  • Application identification classification logic has been improved for NetBIOS and RPC. PR1357093

  • Control traffic loss might be seen on SRX4600 platform. PR1357591

  • When activating security flow traceoptions, the unfiltered traffic is captured. PR1367124

  • SRX1500 continues to generate an alarm on fan Tray 0 Fan 0 Spinning Degraded. PR1367334

  • The pkid process might stop after RG0 failover. PR1379348

  • On SRX1500 devices, the activity LED (right LED) for 1-Gigabit Ethernet/10-Gigabit Ethernet port is not on although traffic is passing through that interface. PR1380928

  • Password recovery menu is not shown on SRX Series devices. PR1381653

  • Large file downloads slow down for many seconds. PR1386122

  • Traffic might be processed by the VRRP backup when multiple VRRP groups are configured. PR1386292

  • Junos OS release 18.3R1 cannot be installed through TFTP in boot loader on SRX300 line of devices. PR1390858

  • Performance drops are seen in SRX345 and SRX340 platforms for IDP C2S policy. PR1395592

  • These messages are seen: /kernel tcp_timer_keep:Local(0x80000004:54652) Foreign(0x80000004:33160). PR1396584

  • On SRX4600 platform, the 40-Gigabit Ethernet interface might flap continuously by MAC local fault. PR1397012

  • 40-Gigabit Ethernet 100-Gigabit Ethernet ports might take a long time (about 30 seconds) to link up on SRX4600 platform. PR1397210

  • SRX Series devices might not strip VLAN added by native VLAN ID command. PR1397443

  • SRX Series devices connection to JIMS keeps flapping, causing failover to secondary JIMS. PR1398140

  • High jsd or na-grpcd CPU usage might be seen even when JET or JTI is not used. PR1398398

  • On SRX4600 and SRX5000 devices, BGP packets might be dropped under high CPU usage. PR1398407

  • VLAN push might not work on SRX1500. PR1398877

  • Increase DAG feed scale number to 256 from 63. PR1399314

  • The authd might stop when issuing the show network-access requests pending command during the authd restart. PR1401249

  • SRX Series device cannot obtain IPv6 address through DHCPv6 when using a PPPoE interface with a logical unit number greater than 0. PR1402066

  • Unable to access SRX Series platforms if the messages kern.maxfiles limit exceeded by uid 65534, please see tuning(7) are seen. PR1402242

  • CPU is hitting 100 percent with fragmented traffic. PR1402471

  • On SRX5400, SRX5600, and SRX5800 devices with SPC3, when PowerMode IPsec is enabled, the show security flow statistics and show security flow session tunnel summary commands will not count or display the number of packets processed within PowerMode IPsec, because these packets do not go through regular flow path. PR1403037

  • Downloads might stall and/or completely fail when utilizing services that are reliant on TCP proxy. PR1403412

  • Transit UDP 500/4500 traffic might not pass across SRX5000 Series devices when using SPC3/SPC2. PR1403517

  • The flowd process stops and all cards go offline. PR1406210

  • The RG1 failover does not happen immediately when the SPC3 card crashes. PR1407064

  • The flowd process might crash if the enable-session-cache command is configured under the SSL termination profile. PR1407330

  • The kernel might crash on the secondary node when committing set system management-instance. PR1407938

  • Memory leak occurs if AAMW is enabled. PR1409606

  • Traffic might be lost and CPU might spike high if SSL proxy is enabled. PR1414467

  • Any traffic originated from the device itself might be dropped in the IPsec tunnel. PR1414509

  • The input and output bytes or bps statistic values might not be identical for the same size of packets. PR1415117

  • The reth interfaces are now supported when configuring SSL Decryption Mirroring (mirror-decrypt-traffic interface). PR1415352

  • Traffic might be dropped if SOF is enabled in a chassis cluster in active/active mode. PR1415761

  • The command show security firewall-authentication jims statistics will output statistics of both the primary JIMS server and secondary JIMS server. PR1415987

  • when enabling PMI on SRX5400, SRX5600, and SRX5800 devices with SPC3 card or SRX4100, SRX4200, and SRX46000 devices, the flowd process stops when large size packets go through IPsec tunnel with the post fragment check triggered. PR1417219

  • Traffic logging shows service-name junos-dhcp-server for UDP destination port 68. PR1417423

  • Traffic might be lost on the SRX Series device if IPsec session affinity is configured with ipsec-performance-acceleration. PR1418135

  • On all SRX Series devices, if the traffic-log feature is configured, logs might incorrectly display IPv4 addresses in an IPv6 format. PR1421255

  • The show security flow session session-identifier < sessID> is not working if the session ID is bigger than 10M on SRX4600 platform. PR1423818

  • Alarms triggered due to high temperature when operating within expected temperatures. PR1425807

  • PIM neighbors might not come up on SRX Series chassis cluster. PR1425884

  • The IPsec traffic going through SRX5000 line of devices with SPC2 cards installed causes high SPU CPU utilization. PR1427912

  • SPC3: Uneven distribution of CPU with high PPS on device. PR1430721

  • SRX550M running Junos OS Release 18.4R1 shows PEM 1 output failure message, whereas with Junos OS Release 15.1X49 or Junos OS Release 18.1R3.3 it does not show any alarms. PR1433577

Interfaces and Chassis

  • Switching interface mode between family ethernet-switching and family inet/inet6 might cause traffic loss. PR1394850

  • On SRX1500 platform, traffic is blocked on all interfaces after configuring the interface-mac-limit command on one interface. PR1409018

Intrusion Detection and Prevention (IDP)

  • IDP might crash with the custom IDP signature. PR1390205

  • Unable to configure dynamic-attack-group. PR1418754

Installation and Upgrade

  • ISSU failed from Junos OS Release 18.3R1.9 to Junos OS Release 18.4R1.4. PR1405556


  • In the J-Web dashboard, the Security Resources widget did not display absolute values. PR1372826

  • The Security Log Event Details window size was increased to display all relevant information about an event. PR1373357

  • J-Web now supports defining SSL Proxy and redirect (block page) profiles when a policy contains dynamic applications. PR1376117

  • Threat Assessment Report shows overlapping text and data. PR1397884

  • Special character used in the pre-shared-key is removed silently after a commit operation on J-Web. PR1399363

  • Configuring using the CLI editor in J-Web generates an mgd core file. PR1404946

  • The httpd-gk process stops, leading to dynamic VPN failures and high Routing Engine CPU utilization up to 100 percent. PR1414642

  • J-Web configuration change for an address set using the search function results in a commit error. PR1426321

  • User unable to view GUI when logged in as read-only user. User is presented with an empty page after logging in. PR1428520

  • On SRX Series devices, J-Web incorrectly displays port mode access for the link aggregation interfaces despite them being configured with multiple VLAN IDs and port mode trunk. PR1430414

  • IRB interface is not available in zone option of J-Web. PR1431428

Logical and Tenant Systems

  • Tenant system administrator can change VLAN assignment beyond the allocated tenant system. PR1422058

Multiprotocol Label Switching (MPLS)

  • The rpd might restart unexpectedly when no-cspf is configured and lo0 is not included under the RSVP protocol. PR1366575

Network Address Translation (NAT)

  • On SRX Series devices with SPC3 in mixed mode NAT SPC3 core files are generated at ../sysdeps/unix/sysv/linux/raise.c:55. PR1403583

  • The nsd process stops and causes the Web filter to stop working. PR1406248

Network Management and Monitoring

  • The set system no-redirects setting does not take effect for the reth interface. PR894194

  • The chassisd might stops and restart after the AGENTX session timeout between master(snmpd) and subagent. PR1396967

  • Partial traffic might get dropped on an existing LAG. PR1423989

Platform and Infrastructure

  • High httpd utilization after reboot failover. PR1352133

  • In chassis cluster redundancy group failover scenario, on SRX5600 and 5800 platforms, if the failover is caused by interface monitoring failure, the failover on PFE side (that is data plane) might be slow (example-impact on BFD session up to several seconds). PR1385521

  • Memory leak might occur on the data plane during composite next-hop installation failure. PR1391074

  • The flowd process might stop if there are too many IPsec tunnels. PR1392580

  • The flowd process stops if it goes into a dead loop. PR1403276

  • HA failed with the failure code HW after loading the image. PR1406029

  • Session capacity of SRX340 device does not match with SRX345 device. PR1410801

  • PEM 0 or PEM 1 or FAN, I2C Failure major alarm might be set and cleared multiple times. PR1413758

  • HA packets might be dropped on SRX5000 line of devices with IOC3 or IOC2 cards. PR1414460

  • Complete device outage might be seen when an SPU vmcore is generated. PR1417252

  • Some applications might not be installed during upgrade from an earlier version that does not support FreeBSD 10 to FreeBSD 10 (based system). PR1417321

  • On SRX Series device, flowd process stops might be seen. PR1417658

  • Routing Engine CPU utilization is high and eventd is consuming a lot of resources. PR1418444

  • On SRX4600 devices, commit failed while configuring 2047 VLAN IDs on the reth interface. PR1420685

Routing Policy and Firewall Filters

  • The show security flow session command now fully supports the dynamic application. PR1387449

  • Memory leak in nsd causes configuration change to not take effect after a commit. PR1414319

  • The flowd process(responsible for traffic forwarding in SRX) stops on SRX devices while deleting a lot of policies from Junos Space. PR1419704

  • A commit warning will now be presented to the user when a traditional policy is placed below a unified policy. PR1420471

  • The dynamic-address summary's IP entry count does not include IP entries in root logical system. PR1422525

  • One new alarm is created NSD fails to restart because subcomponents fail. PR1422738

  • The ipfd generates a core file while scaling cases 6-1. PR1431861

Unified Threat Management (UTM)

  • Whitelist and blacklist do not work for HTTPS traffic going through Web proxy. PR1401996

  • On SRX Series devices, when configuring Enhanced Web Filtering on the CLI, the autocomplete function did not properly handle or suggest custom categories. PR1406512

  • On SRX Series devices, when using Unified Policies and Web filtering (EWF) without SSL proxy, the Server Name Indication (SNI) might not be identified correctly and the RT_UTM logs were recorded incomplete information. PR1410981

  • The device might not look up the blacklist first in the local Web filtering environment. PR1417330

  • Unable to achieve better Avira AV TP on SRX4600 devices due to reaching mbuf high watermark. PR1419064

  • UTM Web filtering status shows down when using hostname [routing-instance synchronization failure]. PR1421398

  • When using unified policies, the base filter for certain UTM profiles might not be applied correctly. PR1424633

  • The custom-url-categories are now pushed correctly to the Packet Forwarding Engine under all circumstances. PR1426189

User Interface and Configuration

  • Tenant system administrator cannot view its configuration with Empty Database message when using groups. PR1422036


  • On SRX1500 device, when configuring IPsec VPN and BGP simultaneously, the kmd process might stop and generate a core file if BGP peers reach approximately 350. All of the VPN tunnels will be disconnected during the pause. PR1336235

  • SPC3 ike sa detail output is not showing proper traffic statistics. PR1371638

  • On SRX5400, SRX5600, and SRX5800 devices with SPC3, the show security ike security-association detail command does not display local IKE-ID field correctly. PR1388979

  • A few VPN tunnels do not forward traffic after RG1 failover. PR1394427

  • The kmd process might stop when SNMP polls for the IKE SA. PR1397897

  • VPN tunnels flap after adding or deleting a configuration group in edit private mode on a clustered setup. PR1400712

  • Syslog is not generated when the IKE gateway rejects a duplicate IKE ID connection. PR1404985

  • Idle IPsec VPN tunnels without traffic and with ongoing DPD probes can be affected during RG0 failover. PR1405515

  • Not all the tunnels are deleted when the authentication algorithm in IPsec proposal is changed. PR1406020

  • Traffic drops on peer due to bad SPI after first reauthentication. PR1412316

  • On SRX5400, SRX5600, and SRX5800 devices with SPC3, when the SRX Series device is configured to initiate IKEv2 reauthentication when NAT traversal is active, occasionally reauthentication might fail. PR1414193

  • The flowd/srxpfe process might stop when traffic selector is used for IPsec VPN. PR1418984

  • Group VPN IKE security associations cannot be established before RG0 failover. PR1419341

  • The show security ike sa detail command shows incorrect value in the IPSec security associations column. PR1423249

  • On SRX Series devices with SPC3, SRX Series device does not send IKE delete notification to the peer if the traffic selector configuration is changed. PR1426714

  • The kmd process stops and generates a core file after running the show security ipsec traffic-selector command. PR1428029

Resolved Issues: 18.4R1

Application Layer Gateways (ALGs)

  • When the IPsec ALG is used, the IPsec tunnel payload is dropped after the IKE or IPsec tunnel reestablishment because of a session conflict. PR1372232

  • If the SIP ALG is disabled, the SIP active sessions are affected. PR1373420

  • Sun RPC data traffic for previously established ALG sessions might be dropped because it matches the gate that contains old interface information. PR1387895

  • A flowd process might generate core files when cross-tenant ALG traffic is sent. PR1388658

  • DNS requests with the EDNS (extension mechanisms for DNS) option option might be dropped by the DNS ALG. PR1379433

Chassis Cluster

  • On SRX340 and SRX345 devices, half-duplex mode is not supported because BCM53426 does not support half-duplex mode. BCM5342X SoC port configurations, BCM53426 does not have QSGMII interface. Only the QSGMII port supports half-duplex mode. PR1149904

  • On an SRX4600 device with chassis cluster enabled, when a failover occurs the dedicated fabric link is down. PR1365969

  • The device in chassis cluster might be unresponsive if IP monitoring is enabled. PR1366958

  • The show chassis environment fpc # command, which is used to display the FPC voltage, is enhanced to show the current and power consumption for an SPC3. PR1368507

  • On SRX Series devices in chassis cluster, the minor Potential slow peers are: FWDD0 XDPC1 XDPC8 FWDD1 alarm is observed, which can be ignored. PR1371222

  • Multiple flowd process files are seen on node 1 after an RG0 failover. PR1372761

  • Traffic loss occurs when the primary node is rebooting. PR1372862

  • On SRX Series devices in chassis cluster, if reroute occurs on the IPv4 wings of a NAT64 or NAT46 session, the active node sends RTO message to the backup session to update the rerouted interface. PR1379305

  • On SRX4600 devices in a chassis cluster, the FPCs go offline if the chassis cluster IDs are more than 10. PR1390202

Class of Service (CoS)

  • When the host-outbound-traffic statement is configured in class of service (CoS), the device stops working when a corrupted packet arrives on the Packet Forwarding Engine. PR1359767

Command-Line Interface (CLI)

  • The following CLI command outputs are not displayed correctly: show usp memory segment shm data module and show jsf shm module. PR1387711

Flow-Based and Packet-Based Processing

  • On SRX320, SRX340, SRX340, and SRX550 devices, the rpd process stops when you configure the auto-bandwidth option under the MPLS label-switched path (LSP). PR1331164

  • The security logs for unified policies are improved to reflect the reason for a denied or rejected session. PR1338310

  • The IPsec replay error for Z-mode traffic is observed. PR1349724

  • When the output interface configured in the X2 mirrored filter is down, the flowd process might stop. PR1357347

  • On SRX4200 and SRX4600 devices, when the device is being rebooted or powered on, control traffic loss is observed. PR1357591

  • IDP inline-tap mode is not supported and configuration for SPC3 must be disabled. PR1359591

  • The syslog usage is deprecated, use the ERRMSG for relevant messages. PR1360274

  • On the secondary control plane, a multicast session leak is observed for the PIM register. PR1360373

  • The application layer protocol negotiation (ALPN) fails because the SSL proxy removes the ALPN extensions from the TLS packets. PR1360820

  • On the SRX550M device, traffic might be duplicated and forwarded to the wrong interface. PR1362514

  • The show services application-identification statistics applications command displays the application-system-cache error message. PR1363033

  • On SRX Series devices, application identification (AppID) is supported for HTTP, SMTPS, POP3S, and IMAPS protocols. PR1365810

  • When RG0 failover occurs, the flowd process generates core files. PR1366122

  • The request services user-identification authentication-table delete authentication-source command output displays incorrect results. PR1366767

  • On SRX Series devices, when AppQoE is enabled and the traffic starts flowing, the flowd process might stop. PR1367599

  • On an SRX1500 device with Junos OS Release 15.1X49-D140, the srxpfe process might not work. PR1370900

  • The device under test (DUT) sends incorrect rejection code when the destination device is not reachable. PR1371115

  • The SPC3 core file size is larger than the SPC1 and SPC2 core files. PR1371447

  • On SRX4100 and SRX4200 devices, the UDP IMIX throughput is decreased. PR1373019

  • In chassis cluster mode with the IPsec tunnel configured, packet loss is observed when the clear-text packets are processed. PR1373161

  • Using the SPC3 improves the performance of the unified policies. PR1374231

  • A summary option for the show system security-profile assignment command is added to provide summary of security profile assignment for the entire device. PR1376990

  • The SPC3 card might be installed on any slot except slot 0, slot 1, and slot 11. PR1378178

  • On SRX Series devices working in a PIM sparse mode, and located between a first-hop router and a rendezvous point (RP), if a PIM control session is created through the PIM register stop message, only the next PIM register message can be forwarded, and after this first message, the subsequent PIM register messages (also matching the PIM control session above) are wrongly dropped. PR1378295

  • When the datapath-debug capture is stopped, incorrect error message is displayed. PR1381703

  • On an SRX5600 device in a chassis cluster, if respmod is enabled for ICAP, the connection with the ICAP server might reset automatically. PR1382376

  • On SRX300, SRX320, SRX340, SRX345, SRX550M devices, during the path MTU discovery, the control engine does not receive the message frag needed and DF set. PR1389428

  • The set security flow log dropped-illegal-packet and set security flow log dropped-icmp-packet CLI commands are unhidden. PR1394720

  • On SRX Series devices, the active flow monitoring does not work for multiple collectors. PR1396482

Interfaces and Chassis

  • The virtual IP address of the Virtual Router Redundancy Protocol (VRRP) might not respond to the host-inbound traffic. PR1371516

Intrusion Detection and Prevention (IDP)

  • The IDP might not be deployed because the IDP configuration cannot be committed. PR1374079

  • The unified policies configured with IDP might not inspect the arbitrary sessions, and are marked as Not Interested within the show security idp counters flow command. PR1385094


  • The PPPoE interface pp0 is not displayed on the J-Web's Interfaces > Port page. PR1316328

  • The dynamic application configuration page in J-Web does not display application signatures in the result if the signatures are searched by category field. PR1344165

  • The J-Web setup does not populate the DHCP attributes. PR1370700

  • The chassis cluster image is not displayed on the J-Web dashboard. PR1382219

Logical Systems

  • The logical system licenses fail to bind to the tenants or logical systems after the device is rebooted. PR1380144

  • The logical system license limit is increased to three. One license is for root-logical-system traffic and the other two licenses are for the logical system and the tenant to transfer the traffic. PR1384659

  • Tenant for logical system installation failed on node 1 after upgrading ISSU. PR1388336

Network Address Translation (NAT)

  • Source NAT sessions might fail to be created when the port-overloading or the port-overloading-factor statement is configured. PR1370279

Network Management and Monitoring

  • The show snmp mib walk etherStatsTable command displays incorrect results. PR1335808

  • The eventd process generates core file, when the incoming system log message length is at or beyond the maximum supported size. PR1366120

Platform and Infrastructure

  • On SRX1500 devices, when the power supply fails, the trap sent might contain incorrect information. PR1315937

  • On SRX300, SRX320, SRX340, and SRX345 devices, you are unable to lock the USB port. PR1352104

  • On SRX4100 and SRX4200 devices, the SRX Network Time Protocol (NTP) client might not stay synchronized to the NTP server and as a result the device clock often switches from NTP to local time. PR1357843

  • On SRX5400, SRX5600, and SRX5800 devices, log messages are seen often when an IOC card has the same identifier as the SPC card. PR1357913

  • When the secure copy protocol (SCP) fails to transfer the active configuration to an archive site, the archive site also fails. PR1359424

  • On SRX4600 devices, the show chassis fan show chassis environment command does not display any output. PR1363645

  • Packet capture feature does not work after the sampling configuration is deleted. PR1370779

  • On SRX Series devices in a chassis cluster, the cold synchronization process might slow down when there are many Packet Forwarding Engines installed on the device. PR1376172

  • Junos OS upgrade might fail when you use the validate option after the /cf/var/sw directory is erroneously deleted. PR1384319

Routing Policy and Firewall Filters

  • The TCP protocol ports 5800 and 5900 are added to junos-defaults to support the VNC application. PR1333206

  • The show security policies detail command output is modified to improve readability, particularly for unified policies. PR1338307

  • The timeout value of junos-http is not accurate. PR1371041

  • When the dynamic address is referenced in the dynamic-address field and the destination IP address for the traffic is matched within this dynamic address, the policy fails to match the traffic PR1372921

Routing Protocols

  • If family iso is enabled through the GRE over IPSec tunnel, the vFPC stops working. PR1364624

Services Applications

  • When the ICAP configuration and the traffic passing through are modified, core files might be generated. PR1389600

  • Clearing the TCP session might not clear the redirect objects. PR1390835

System Logs

  • On SRX Series devices, the following false log message is observed. are observed: /kernel: check_configured_tpids: < interfaces > : default tpid (0x8100) not configured. pic allows maximum of 0 tpids. PR1373668

Unified Threat Management (UTM)

  • The default actions under a Web filtering profile might not work properly. PR1365389

  • When the server port is configured as 443, the displayed EWF server status is UP. PR1383695


  • IPsec tunnel might not work when there are concurrent IKEv2 Phase 1 SA rekeys. PR1360968

  • On SRX5600 and SRX 5800 devices, during a migration from VPN to AutoVPN configuration, traffic loss is observed. PR1362317

  • On SRX Series devices in a chassis cluster, when the VPN configuration size reaches an internal configuration processing chunk size, the VPN tunnels might not be configured successfully and the VPN tunnels might not come up after rebooting, upgrading, or restarting ipsec-key-management. PR1376134

  • Packet loss is observed in IPsec Z-mode scenario. PR1377266

  • The kmd process might stop and cause VPN traffic outage after the show security ipsec next-hop-tunnels command is run. PR1381868

  • Adding or deleting site-to-site manual NHTB VPN tunnels to an existing st0 unit causes the existing manual NHTB VPN tunnels under the same st0 unit to flap. PR1382694

Documentation Updates

There are no errata or changes in Junos OS Release 18.4R2 for the SRX Series documentation.

Migration, Upgrade, and Downgrade Instructions

This section contains the procedure to upgrade Junos OS, and the upgrade and downgrade policies for Junos OS. Upgrading or downgrading Junos OS can take several hours, depending on the size and configuration of the network.

Upgrade and Downgrade Support Policy for Junos OS Releases and Extended End-Of-Life Releases

Support for upgrades and downgrades that span more than three Junos OS releases at a time is not provided, except for releases that are designated as Extended End-of-Life (EEOL) releases. EEOL releases provide direct upgrade and downgrade paths. You can upgrade directly from one EEOL release to the next EEOL release even though EEOL releases generally occur in increments beyond three releases.

Junos OS upgrade from 15.1X49 directly to 18.4R3 or 18.4R3 based Service Releases is supported for all SRX platforms.

You cannot upgrade directly from a non-EEOL release to a release that is more than three releases ahead or behind. To upgrade or downgrade from a non-EEOL release to a release more than three releases before or after, first upgrade to the next EEOL release and then upgrade or downgrade from that EEOL release to your target release.

For more information about EEOL releases and to review a list of EEOL releases, see

For information about software installation and upgrade, see the Installation and Upgrade Guide for Security Devices.

For information about ISSU, see the Chassis Cluster User Guide for Security Devices.