What could cause my WCF to throw strange Socket Exceptions?

Question

Sometimes it will be a SocketException:

Stack trace:    at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   at System.ServiceModel.Channels.SocketConnection.Write(Byte[] buffer, Int32 offset, Int32 size, Boolean immediate, TimeSpan timeout)

And sometimes it is throwing the following CommunicationObjectAbortedException:

    Stack trace:    at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)

The behavior is very random. It is going against static calls that generally work.

Answer 1

What error?

If is one of the WSA error (100053 WSAECONNABORTED, 10054 WSAECONNRESETand friends) it means the underlying IP stack has closed the socket. If is an async IO pending abort 995 ERROR_OPERATION_ABORTED it means a thread that posted an async I/O request has exited and the request was aborted by the OS.

Answer 2

The class which implements the interface with the ServiceContract on it is only instantiated once and the methods reused. This causes multithreading exceptions which are not passed back to the client and not logged in the event log.