FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
Description This article describes the necessary configuration to allow the captive portal logged on user to force a logoff.
Solution There is a configuration option that can be enabled on the CLI which will make the authentication keep alive and the user can logout.
If the fortigate in VDOM:
#config global config system global set auth-keepalive enable end
Authentication keep alive keeps authenticated firewall sessions from ending when the authentication timeout ends. When enabled, an HTML page will be displayed and the firewall authentication keep alive will prevent sessions from ending when the authentication timeout ends. In that page, the user can logout completely from the captive portal as well.