- Plesk for Linux
- Plesk for Windows
The website example.com is secured with the purchased SSL certificate.
The following warning is shown when opening this website in Firefox:
CONFIG_TEXT: example.com uses an invalid security certificate.
The certificate is not trusted because the issuer certificate is unknown.
The server might not be sending the appropriate intermediate certificates.
An additional root certificate may need to be imported.
Error code: SEC_ERROR_UNKNOWN_ISSUER
One of the CA certificates is incorrect.
- Retrieve the correct CA certificate set from the SSL certificate provider.
- Install the certificate anew as described in the article How to install SSL certificate for a domain in Plesk.