I installed Exchange 2013 on Windows Server 2012. After restarting the Host I could not login into owa or ecp the login screen showed up but after entering my correct credentials I would get a HTTP 500 Error. The error persited after multiple reboots of the Exchange server. Some googling revealed to me that this might be caused by the Forms Based Authentication Serivce not running. But looking at the Services List I cant seem to even locate it. Anyone got any idea why this might happen or could give me the exact name of the service as I might be to stupid to read properly ^^.