Re-direct loop to login page

[rayha]

Hi all,

        Has anyone encountered when you successfully login, it does not direct you to the fortigate main page but to the login page again? I tried several times on the edge and chrome and the result still the same. I am accessing this direct from internet

      I had no such issue when i access via the management port. 

      Anything to do with my browser settings?

[pminarik]

This has been known to happen when the standard TCP/80/443 ports for HTTP/HTTPS are proxied by some other network device in-between, changing the source MAC address of the packets, but the captive portal ports (by default 1000/1003) are not. by default authenticated sessions are bound to both the IP and the MAC addr, which is disrupted by that sort of proxying.

You can confirm this by running a packet capture on the FortiGate for a given client, focusing on the 80/443/1000/1003 ports, and checking if the src MAC changes. If yes, you will need to apply the following change:

config user setting

set auth-src-mac disable

end

https://community.fortinet.com/t5/FortiGate/Technical-Note-Authentication-Page-Looping-Issue/ta-p/19...