Problem FortiNet Proxy

[Rogerio1]

I have the 100 version FortiGate D and also use as a proxy server, but several sites show the error below: Can anyone help how to solve this problem? 504 Gateway Timeout: remote server did not respond to the proxy.

[Fullmoon]

Hi, had similar issue too, how you handle this situation? whats your workaround? 

[Sys_Helpdesk]

Same problem here with 100D on vbforums.com

Any chance to solve this problem?

Thanks and greetings!