After upgrade first login worked fine (probably because I had not logged out while doing the upgrade.) But after logging out I could not log back in! Sam
Resetting the admin password with phpMyAdmin did not help. There is no error message. Code: UPDATE sys_user SET passwort = md5('admin') WHERE username = 'admin';
All Login problems in ISPConfig 3.1 that I#ve seen in the various threads here were caused by browser and session caching. That you can login by IP and not FQDN seconds that this is a caching problem. This can be caching in the browser itself or in a proxy server in your network or similar. Empty the browser cache and delete all cookies. I described the steps also in several other threads here in the forum.