I just upgraded to Moodle version 3.4 from 3.1 on a Windows 2012 server, using PHP 7.2 (upgraded from 5.6) and MariaDB. I didn't see any significant issues during the upgrade but clicking the login button (with valid login credentials) or "Login as Guest" button now produces the following error:
"Server Error 405 - HTTP verb used to access this page is not allowed. The page you are looking for cannot be displayed because an invalid method (HTTP verb) was used to attempt access."
This is not a message I have ever really had to deal with before so I'm wondering if there any ideas for troubleshooting what went wrong. So far, I'm not finding anything that is particularly helpful. Any ideas are appreciated.