Hello,
I ran Moodle 2.5.1 as a production site using external database authentication with MD5 encryption (no salt). There were no issues with users logging in.
I upgraded to Moodle 2.9 (latest) using the same external database with MD5 encryption (no salt). While I can login as an administrator (as this is a manual account), none of the users in the external database can login. The error is id (3), which is wrong password.
There is no salt. Config.php has not changed. The external database authentication plugin has not had any settings changed to it.
Any advice to repair this would be much appreciated. Thank you.