It is not possible to access website example.com via HTTPS with the following error in browser
CONFIG_TEXT: Secure Connection Failed
If default certificate is enabled in Home > Domains > example.com > Hosting Settings website can be accessed without errors.
A certificate issued for a domain is installed incorrectly.
Reinstall a certificate issued for a domain. The following article describes the required steps in details: How to install an SSL certificate issued for a domain?