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.

I’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?

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