Secure Computing SG300 User Manual page 176

Enable antivirus
Select Antivirus from the Firewall section of the main menu.
Check Enable.
The Database mirror is the host from which the signature database is updated. Unless
there is a specific host from which you want the SG unit to retrieve signature updates,
leave this at the default setting of database.clamav.net.
Select the frequency to Check for updates from the database mirror. The checks are
quick and shouldn't cause a noticeable decrease to performance unless an update is
necessary.
Enable Check for updates when networking starts to force a virus signature update
when the status of the network changes, e.g. when the Internet connection comes online.
This guarantees a virus signature update when the SG units boots.
Specify the Maximum size in kilobytes of files to scan for viruses. Files over this size are
automatically rejected.
You may Treat encrypted content as viruses – as the SG unit is not the intended
receipient, it does not decrypt encrypted content passing through it, and cannot
determine whether such content is infected.
Specify the Maximum number of simultaneous virus checks to perform. Permitting
more scans increases the amount of memory and CPU resources required by the
antivirus scanning.
Click Submit.
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Firewall