Troubleshooting Tip: Portal page cannot be reached

This article describes the behaviour where the Captive Portal page displays an error indicating the site cannot be reached.  Portal SSL mode is set to Valid SSL certificate.  

Ensure the SSL certificate issued by either a public or internal Certificate Authority (CA) is installed in the Portal target in the Certificate Management view.   

Refer to the appropriate Admin guide for details:

8.8: https://docs.fortinet.com/document/fortinac/8.8.0/administration-guide/966318/certificate-management 
9.1: https://docs.fortinet.com/document/fortinac/9.1.0/administration-guide/966318/certificate-management 
9.2: https://docs.fortinet.com/document/fortinac/9.2.0/administration-guide/966318/certificate-management 

Refer to the appropriate Administration Guide to verify the Portal SSL setting:
8.8: https://docs.fortinet.com/document/fortinac/8.8.0/administration-guide/333502/portal-ssl

9.1: https://docs.fortinet.com/document/fortinac/9.1.0/administration-guide/333502/portal-ssl

9.2: https://docs.fortinet.com/document/fortinac/9.2.0/administration-guide/333502/portal-ssl