Symantec Security 5600 Series, Security 5400 Series,Clientless VPN 4400 Series, Administration Manual

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597 Field descriptions
Policy field descriptions
Related information
For further information related to this topic, see the following:
■
“Responding to virus detections” on page 344
■
“Avoiding potential session time-out errors” on page 340
Rule Properties—Antispam tab
You can enable antispam scanning at the gateway to prevent unwanted email from reaching the mail
server through the SMTP and POP3 protocols. Antispam processing saves network and server
resources. By reducing the number of unwanted interruptions, it also improves individual
productivity.
You can only use this tab if the service group used by the rule contains the SMTP or POP3 protocol.
FTP Indicates whether antivirus scanning is applied to FTP traffic that is controlled by this rule.
This option is only available if the service group used in the rule includes the FTP protocol.
This option is unchecked by default.
If you enable antivirus scanning, you can select any of the following options:
■
Replace deleted files with message file
Replaces an infected attachment in an HTTP container file (for example, a zip file) with
a text file when the infected attachment is deleted.
The text file that is inserted is called deleted%.txt, where % is a sequence number. For
example, if two attachments are deleted, the replacement files are called deleted1.txt
and deleted2.txt.
This option is checked by default.
■
Data comforting
Provides users a quicker download response.
Note that when you enable data comforting, it is possible for a virus-infected file to get
through the security gateway.
This option is unchecked by default.
■
Allow files to be partially downloaded without Antivirus scanning
Lets FTP request a partial file transfer without antivirus scanning.
The antivirus engine cannot scan partially downloaded files because it is unable to
determine the file type for scanning.
This option is unchecked by default.
Table D-29
Rule Properties—Antivirus tab (Continued)
Field Description