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I am getting this error while logging with CME.

This is the complete error message:

System.ServiceModel.FaultException`1[Tridion.ContentManager.CoreService.Client.CoreServiceFault]: Value cannot be empty. Parameter name: userName. (Fault Detail is equal to Tridion.ContentManager.CoreService.Client.CoreServiceFault).

What does this error mean?

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Have you checked if the Tridion Content Manager Service Host is running? Have you tried restarting it? – Elena Serghie Aug 28 '14 at 17:24
yes after making changes i restarted my iis and services – Pankaj786 Aug 29 '14 at 3:42
up vote 4 down vote accepted

Its a IIS issue we have to set Deny Rule For Local User.. Refer Link

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