Technical Tip: How to use UDP protocol for FortiGuard web filter and anti-spam services
Description
This article describes how to use UDP protocol for FortiGuard web filter and anti-spam services.
Solution
By design, the FortiGate will use secure HTTPS connection for FortiGuard web filter and anti-spam services and the option to change the protocol has been removed from GUI.

This article describes how to use UDP protocol for FortiGuard web filter and anti-spam services.
Solution
By design, the FortiGate will use secure HTTPS connection for FortiGuard web filter and anti-spam services and the option to change the protocol has been removed from GUI.

To change the fortiguard port, you have to disable "fortiguard-anycast" option under fortiguard settings then only; the FortiOS will allow to change the protocol to UDP.
# config system fortiguard
set fortiguard-anycast disable <-----
set port 8888
set protocol udp
end
