Antivirus Scanner Settings Overview

The third tab in the device-specific or template-specific antivirus settings is the AV Scanner Settings tab. Table 42 describes the antivirus scanner settings available:

Table 42: Antivirus Scanner Settings

Antivirus Scanner Options

Description

Fail Mode Traffic Permit

Select this check box if you want the device to forward unexamined traffic when it fails to contact the antivirus scanner. If you want the device to block unexamined traffic, leave the box clear.

Maximum AV resources allowed per AV client

Set the maximum percentage of device resources a single source can occupy at one time. Prevent one source from overwhelming the device.

HTTP keep alive

Select this check box to keep the HTTP connection alive while antivirus scanning occurs.

Trickling

Forward some HTTP traffic to the requesting client so the browser does not time out during the antivirus scan. The following are the trickling settings and its respective steps for configuration:

  • Disable — Disables HTTP trickling.
  • Default — Enables HTTP trickling using the stated predefined parameters. If content length is larger than 3 MB, trickle 500 bytes for every 1 MB sent for scanning.
  • Custom — Enables HTTP trickling using user-defined parameters.

    To configure trickling:

    1. In the Minimum length to start trickling (MB) box, select the minimum size (in megabytes) of an HTTP file to trigger trickling. Note that you must enter a valid integer value less than 4096.
    2. In the Trickle for every (MB) box, select the size (in megabytes) of a block of traffic to which the security device applies trickling.
    3. In the Trickle size box (Bytes) box, select the size (in bytes) of unscanned traffic that the security device forwards.

Warning message for virus notification

For FTP, HTTP, IMAP, POP3, and SMTP only. Allows you to customize the warning message for virus notification. When a virus is detected, the AV scanner appends the customized warning message to the default message and the device sends the message to the client. If you do not set a customized message, the AV scanner sends only the default warning message.

Subject of virus notification e-mail

For IMAP, POP3, and SMTP only. Allows you to set a customized subject for virus notification e-mail. When the AV scanner sends an AV notification e-mail to the client on detecting a virus, the AV scanner uses the default e-mail subject, if you do not set the customized subject. You can configure the AV scanner to use a customized subject for the virus notification email.

Source address of notification e-mail

For IMAP, POP3, and SMTP only. Allows you to set a customized source address for virus notification e-mail. When the AV scanner sends an AV notification e-mail to the client on detecting a virus, by default, the AV scanner uses the IP address of the security device. You can configure the AV scanner to use a customized source address for the virus notification e-mail.

Charset of virus notification e-mail

For IMAP, POP3, and SMTP only. Allows you to enter the character set for the notification e-mail. If the notification e-mail includes Japanese or other double-byte characters, you can specify the character set to be used to display the notification e-mail. For example, if the virus notification e-mail includes Japanese characters, you can set the charset to shift_jis.

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