Product:
Cognos Controller 10.1
Windows 2008 R2

Symptom:
Get error when select maintain – manage active users from inside Cognos Controller client.
After we have changed the controller database.

Error message:
System.Web.service.Protocols.SoapException: Server was unable to process request. –>
System.Runtime.InteropService.COMException (0x80070070):
Method ‘~’ of object ‘~’ failed
at FrUserValidator.ValidatorClass.IsMenuItemAllowed(String sMenuIDs, String sMode, String sWebServiceAction)
at….

Possible Solution (workaround):

Restart the physical server.

Restart of the Cognos Controller services in Windows 2008 Server did not help.
This error is from the Component Services COM+ Applications.