Chapter 10 Install and System Administration for FortiOS 5.0 : FortiGuard : Web filtering : Web Filtering and Email Filtering Options
  
Web Filtering and Email Filtering Options
Go to System > Config > FortiGuard, and expand arrow to view Web Filtering and Email Filtering Options for setting the size of the caches and ports used.
Web Filter cache TTL
Set the Time To Live value. This is the number of seconds the FortiGate unit will store a blocked IP or URL locally, saving time and network access traffic, checking the FortiGuard server. Once the TTL has expired, the FortiGate unit will contact an FDN server to verify a web address. The TTL must be between 300 and 86400 seconds.
Antispam cache TTL
Set the Time To Live value. This is the number of seconds the FortiGate unit will store a blocked IP or URL locally, saving time and network access traffic, checking the FortiGuard server. Once the TTL has expired, the FortiGate unit will contact an FDN server to verify a web address. The TTL must be between 300 and 86400 seconds.
Port Section
Select the port assignments for contacting the FortiGuard servers. Select the Test Availability button to verify the connection using the selected port.
To have a URL's category rating re-evaluated, please click here
Select to re-evaluate a URL’s category rating on the FortiGuard Web Filter service.
See Also
URL verification
Antivirus and IPS Options
FortiGuard Services
Antivirus and IPS
Web filtering
Email filtering
Security tools
Troubleshooting