Get this generic err sporadically
{"Message":"Authentication failed.","StackTrace":null,"ExceptionType":"System.InvalidOperationException"}
when calling a WCF service hosted in the same application domain
[ServiceBehavior(IncludeExceptionDetailInFaults = true, InstanceContextMode = InstanceContextMode.PerSession), AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode Go to the complete details ...