No mapping between account names and security IDs was done. (Exception from HRESULT: 0x80070534)

I have 2 COM+ (Managed) running in 2 machines. They communicate with each other using COM+ interface API.

COM+-1 calls COM+-2. COM+-1 impersonates an common domain user say "MyDomain\MyUser". Then it calls a method on COM+-2 (say CheckMe). In this method, a call is made to IsUserinRole of SecurityCallContext.CurrentCall.

COM1+ runs under same identity like MyDomain\COMPLUSUser1.

COM2+ runs under same identity like MyDomain\COMPLUSUser2

SecurityCallContext.CurrentCall.IsUserInRole(user, role)

Thanks & Regards

Vic Vega