Thank you all for responses to my problem. The problem has just been solved! The customer had added an AAAA record (IP6) in DNS for the domain,...
Thanks for your answer! There is no .htaccess file installed, I made sure of that when debugging this error.
I am trying to install SSL certificate on a website by checking "SSL" and "Let's Encryupt SSL" under the Domain tab. Please note I have more than...
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