Troubleshooting Tip: Joining as a domain user to resolve white page on a portal when white page is not due to certificate, web filter or app control issue on a FortiGate

1. Check that the certificate of the website has not expired and is trusted by the browser.
2. Check that the website is not blocked by a web filter or app control. 
3. White page issues can be fixed by signing up as a domain user:
   Centralized Verification: A centralized Active Directory domain, which offers a single point of authentication for numerous apps and resources, is used to manage domain users.
4. Portal Compatibility: A lot of applications and portals are made to function with domain authentication, depending on it to manage user access.

The white page is encountered when the user joins in as a local user and not a domain user.

Solved by joining in as a domain user: