Build 926 - Socket connection abort

Have no idea how I triggered this.

Exception: CommunicationException 
Message: The socket connection was aborted. This could be caused by an error processing your message or a receive timeout being exceeded by the remote host, or an underlying network resource issue. Local socket timeout was '00:00:09.9989999'. 
Stack Trace: at System.ServiceModel.Channels.SocketConnection.ReadCore(Byte[] buffer, Int32 offset, Int32 size, TimeSpan timeout, Boolean closing) 
at System.ServiceModel.Channels.SocketConnection.Read(Byte[] buffer, Int32 offset, Int32 size, TimeSpan timeout) 
at System.ServiceModel.Channels.SessionConnectionReader.Receive(TimeSpan timeout) 
at System.ServiceModel.Channels.SynchronizedMessageSource.Receive(TimeSpan timeout) 
at System.ServiceModel.Channels.TransportDuplexSessionChannel.Receive(TimeSpan timeout) 
at System.ServiceModel.Channels.TransportDuplexSessionChannel.TryReceive(TimeSpan timeout, Message& message) 
at System.ServiceModel.Channels.InputChannelWrapper.TryReceive(TimeSpan timeout, Message& message) 
at System.ServiceModel.Channels.ServerReliableChannelBinder`1.DuplexServerReliableChannelBinder`1.OnTryReceive(TDuplexChannel channel, TimeSpan timeout, RequestContext& requestContext) 
at System.ServiceModel.Channels.ReliableChannelBinder`1.TryReceive(TimeSpan timeout, RequestContext& requestContext, MaskingMode maskingMode) 
at System.ServiceModel.Security.SecuritySessionServerSettings.ServerSecuritySessionChannel.TryReceiveRequest(TimeSpan timeout, RequestContext& requestContext) 
at System.ServiceModel.Security.SecuritySessionServerSettings.ServerSecuritySessionChannel.TryReceive(TimeSpan timeout, Message& message) 
at System.ServiceModel.Security.SecuritySessionServerSettings.ServerSecurityDuplexSessionChannel.WaitForInputSessionClose(TimeSpan timeout, Boolean& wasAborted) 
at System.ServiceModel.Security.SecuritySessionServerSettings.ServerSecurityDuplexSessionChannel.OnClose(TimeSpan timeout) 
at System.ServiceModel.Channels.CommunicationObject.Close(TimeSpan timeout) 
at System.ServiceModel.Channels.ServiceChannel.OnClose(TimeSpan timeout) 
at System.ServiceModel.Channels.CommunicationObject.Close(TimeSpan timeout) 
at System.ServiceModel.Dispatcher.MessageRpc.CloseChannel() 

Exception: SocketException 
Message: An existing connection was forcibly closed by the remote host 
Stack Trace: at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags) 
at System.ServiceModel.Channels.SocketConnection.ReadCore(Byte[] buffer, Int32 offset, Int32 size, TimeSpan timeout, Boolean closing)