Security Services
Configuring Anti-Virus
Cisco ISA500 Series Integrated Security Appliances Administration Guide 306
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STEP 5 In the Update Virus Database area , specify h ow to update th e Anti-Virus
signatures. You can automatically check for signature updates from Cisco’s
signature server every 24 hours or manually check for signature updates at any
time by clicking Update. See Updating Anti-Virus Signatures, page 308.
STEP 6 Click Save to apply your settings.
Configuring Advanced Anti-Virus Settings
Use the Advanced Settings page to configure the scan settings.
STEP 1 Click Se curity Services > Anti-Virus > Advanced Settings.
STEP 2 Maximum File Size to Scan: Enter the maximum file size, from 0 to 10240
kilobytes. Files larger than this size are passed without scanning. Use the default
setting, 0, to indicate that there is no limit on the file size.
NOTE: For compressed files, Anti-Virus will scan each file after decompression
and bypass virus scanning for the files larger than the maximum file size.
STEP 3 For each protocol, make the desired selections:
•HTTP:
- Che ck the Optimize Performance box to suspend the Anti-Virus scan for
websites with a good reputation. Uncheck the box to scan all sites. This
option is available only when Web Reputation Filtering is enabled. For
more information, see Configuring Web Reputation Filtering, page 325.
- Che ck the Disable HTTP Resume box to disable resuming web-based
file transfer by using the HTTP protocol when viruses are detected.
Uncheck the box to allow resuming web-based file transfers in this
situation.
•FTP: Check the Disable FTP Resume box to disable resuming file transfer
by using the FTP protocol when viruses are detected. Uncheck the box to
enable resuming file transfers in this situation.
STEP 4 Click Save to apply your settings.