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Known Limitations

Learn about known limitations in Junos OS Release 21.4R1 for SRX Series Gateways.

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


You can use IPv6 address for generic routing encapsulation (GRE) tunnel interfaces. To configure a GRE tunnel interface with IPv6 address, specify IPv6 addresses for source and destination at the [edit interfaces gr-0/0/0 unit 0 tunnel] hierarchy level.

Note that GRE keepalive configuration is not supported when you use IPv6 address for both source and destination addresses in a GRE interface configuration. See Configuring GRE Tunnel Interfaces for more details.


  • The Firefox browser displays an unsaved changes error message in the J-Web basic settings page if the autofill logins and passwords option is selected under the browser privacy and security settings. PR1560549


  • On SRX5000 line of devices, in some scenario, the device output might display obsolete IPsec SA and NHTB entry even when the peer tear down the tunnel. PR1432925