Thread:Project:Support desk/Users can't log in after migrating wiki to a new server.

Here's some info up front: MediaWiki 1.15.1 PHP Version 5.3.2-1ubuntu4.9 PostgreSQL 8.3.10 (Hosted on a different server.)

Our wiki is currently running on a rickety old server so I'm trying to migrate it to a new server. It seems to have worked but every time someone tries to log in it tells them they entered the wrong password. I still have the old copy up and running and logging in there is not an issue. It may be important to not that the database is hosted on a separate server that isn't changing. What would be some good things to check in order to troubleshoot this problem?