We faced an issue where in the users who were part of the SCOM 2012 Report Operators were unable to run some Custom Reports. These reports were using a Custom DataSource created for the OpsMgrDB Whenever user tried to open the report ,we received following alert on the SQL Reporting server. he Permission on SSRS is "System User" for 2537B367-6D74-4110-B0B5-1F51C1B1B09E Log Name: Application Source: MSSQLSERVER Date: 10-05-2013 15:41:01 Event ID: 18456 Task Category: Logon Level: Information Keywords: Classic,Audit Failure Description: Login failed for user 'Domain\User01'. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors. [CLIENT: <local machine>] This is what we did and it worked for us: In the Datasource we modified the C...