SSRS: Error: The user or group name ‘CustomerDomain\SomeUser’ is not recognized

Hi all,

When installing SSRS on a installation where the database was a backup of a customor’s setup, I got the following error:

An error occurred while adding users ‘CustomerDomain\SomeUser’,'Domain\SomeUser2′ to the SQL Server Reporting Services DynamicsAXBrowser role in the folder DynamicsAX. The error is: The user or group name ‘CustomerDomain\SomeUser’ is not recognized..

The solution was to remove all records in the SysServerSessions table.

I had to restart the AOS too for the wizard to be able to connect to the AOS again, but that could just be a glitch on my machine.

I lost some time because of this error, so thanks a lot to Paul A. Noakes for posting the solution here:
http://social.technet.microsoft.com/Forums/en-US/winservergen/thread/39babec6-c6ec-4a5d-a4f0-b3ea046e4e56/