Have you changed the value in your config.php?
From:
$CFG->wwwroot = 'http://yousite.edu
To:
$CFG->wwwroot = 'https://yoursite.edu'
I had the same issue, I changed the value manually in the config file and it was back to normal.
From:
$CFG->wwwroot = 'http://yousite.edu
To:
$CFG->wwwroot = 'https://yoursite.edu'
I had the same issue, I changed the value manually in the config file and it was back to normal.