After moving a reporting services database from SQL server 2008r2 to 2012, we had a problem running reports in TFS
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The error was:
An error has occurred during report processing
Cannot impersonate user for data source ‘TfsReportDS’
Log on failed
. Ensure the user name and password are correct. (rsLogonFailed)
For more information about this error navigate to the report server on the local server machine, or enable remote errors
Add a local policy on the SQL server allowing the Report Services User (Reader Account in TFS Admin console) to log on locally or add it to a group which already has these rights.