CAS SSO behind proxy issues

[Baba Ndiaye]

Hello guys 

i deployed CAS 6.4.5 and proxied with nginx it's work fine.

But now i want to use WAF (Web Application Firewall Forti) .it's work like this 

we have a physical node with private IP and in the WAF we configure a virtual server (public IP) and linked to our physical node.

When we try it with a website without CAS SSO it's work fine but with CAS we have a problem this the ticket