Fortiguard block CloudFlare SSL certificate invalid

Hi.

When I try to access my site using office PC which is uses Fortiguard filter shows my SSL certificate invalid and block the access.

Google chrome shows following warnings.

NET:ERR_CERT_AUTHORITY_INVALID.

This is happening only for single website. I use CF for my 3 websites, one site only face this issue.
Below you can find the error screenshot.

My server installed Letsencrypt SSL certificate and CF I use Full(strict) option.

Ultimately the Fortinet is performing a man-in-the-middle attack, your browser is catching it and warning you.

This is usually good, but in your case you are intentionally trying to break your security.

Iā€™d first follow the instructions and make sure that the root certificate is installed. Typically this would affect all sites equally, but perhaps your HSTS settings are different for this site?

1 Like

This topic was automatically closed after 30 days. New replies are no longer allowed.