WCF The underlying connection was closed: An unexpected error occurred on a receive

Question

I am using a RestClient app to communicate with my WCF service .and I am getting the following exception

The underlying connection was closed: An unexpected         


        

Answer 1

Configure WCF tracing in your app.config / web.config and check Error.svclog (it will be created near your binary file) for details. In my case it was because of using Auto-property initializer (property without setter) - a feature from C# 6.0

No set method for property 'FailedCount' in type 'MyProject.Contracts.Data.SyncStatusByVersion'.
   at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.ThrowInvalidDataContractException(String message, Type type)
               at WriteSyncStatusByVersionToJson(XmlWriterDelegator , Object , XmlObjectSerializerWriteContextComplexJson , ClassDataContract , XmlDictionaryString[] )
               ...

To configure WCF tracing: