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> Chapter 24 - Security Profiles > Inspection Modes > Individual Security Profile considerations

Individual Security Profile considerations

In flow mode, AntiVirus and Web Filter profiles only include flow-mode features. Web filtering and virus scanning are still done with the same engines and to the same accuracy, but some inspection options are limited or not available in flow mode. Application control, intrusion protection, and FortiClient profiles are not affected when switching between flow and proxy mode.

Application control uses flow-based inspection; if you apply an additional security profile to your traffic that is proxy-based, the connection will simply timeout rather than display the warning, or replacement, message. However, Application Control will still function.

note icon CASI does not work when using Proxy-based profiles for AV or Web filtering. Make sure to only use flow-based profiles in combination with CASI on a specific policy.

Even though VoIP profiles are not available from the GUI in flow mode, the FortiGate can process VoIP traffic. In this case the appropriate session helper is used (for example, the SIP session helper).

Setting flow or proxy mode doesn't change the settings available from the CLI. However, when in flow mode you can't save security profiles that are set to proxy mode.

You can also add proxy-only security profiles to firewall policies from the CLI. So, for example, you can add a VoIP profile to a security policy that accepts VoIP traffic. This practice isn't recommended because the setting will not be visible from the GUI.

If you set flow-based to use external servers for FortiWeb and FortiMail you must use the CLI to set a Web Application Firewall profile or Anti-Spam profile to external mode and add the Web Application Firewall profile or AntiSpam profile to a firewall policy.

Proxy mode and flow mode antivirus and web filter profile options

The following tables list the antivirus and web filter profile options available in proxy and flow modes.

Antivirus features in proxy and flow mode

Feature Proxy Flow
Scan Mode (Quick or Full) no yes
Detect viruses (Block or Monitor) yes yes
Inspected protocols yes no (all relevant protocols are inspected)
Inspection Options yes yes (not available for quick scan mode)
Treat Windows Executables in Email Attachments as Viruses yes yes
Send Files to FortiSandbox Appliance for Inspection yes yes
Use FortiSandbox Database yes yes
Include Mobile Malware Protection yes yes

Web Filter features in proxy and flow mode

  Feature Proxy Flow
FortiGuard category based filter yes yes (show, allow, monitor, block)
Category Usage Quota yes no
Allow users to override blocked categories (on some models) yes no
Search Engines
yes no
  Enforce 'Safe Search' on Google, Yahoo!, Bing, Yandex yes no
Restrict YouTube Access yes no
Log all search keywords yes no
Static URL Filter yes yes
  Block invalid URLs yes no
URL Filter yes yes
Block malicious URLs discovered by FortiSandbox yes yes
Web Content Filter yes yes
Rating Options yes yes
  Allow websites when a rating error occurs yes yes
Rate URLs by domain and IP Address yes yes
Block HTTP redirects by rating yes no
Rate images by URL yes no
Proxy Options yes no
  Restrict Google account usage to specific domains yes no
Provide details for blocked HTTP 4xx and 5xx errors yes no
HTTP POST Action yes no
Remove Java Applets yes no
Remove ActiveX yes no
Remove Cookies yes no
Filter Per-User Black/White List yes no