The server was unable to process the request due to an internal error. For more information about the error, either turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the <serviceDebug> configuration behavior) on the server in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework 3.0 SDK documentation and inspect the server trace logs
Cause 1: The web service application pool is set to something other than a domain user.
Resolution: Set app pool to domain/user
Cause 2: App pool account is not in Trusted web service account maintenance screen in the Administrator module in Microsoft Dynamics SL
Resolution: Add the app pool account to the Trusted web service account maintenance screen in the Administrator module in Microsoft Dynamics SL