I have already passed several joomla sites under https.
On a site that only has your protection extension backing up in the back office to pass the administration and the site in https, I have plenty of errors http500 or others. So I wanted to go back to the previous state but it does not seem to save in the admin when I put https on: none;
So I disabled the httaccess and put $ live_site = 'http: // www ...'
I do not have access to anything
I wonder if this may be related to your extension !??