fdeutsch
422 is expected. Just the default response code to prevent browsers from suggesting auto-saving credentials. You will need to review your logs (general server logs, webserver error logs, PHP error logs, MySQL/MariaDB error logs, osTicket System Logs, Browser Console logs, etc.) for any related errors. You can also check the ost_syslog
table in the database for any related errors. You also need to check if you are running any authentication plugins that could be causing an issue.
Lastly, you need to provide a screenshot of your Admin Panel > Dashboard > Information page. But since you can't login you will need to let us know what version of osTicket you are running, what PHP version you are running, what webserver you are running (Apache, IIS, NGINX, LiteSpeed), etc.
Cheers.