Hello everyone. I have a system consisting of a server accepting remoting calls from clients with TCP as the underlying transportlayer. It normally works like a charm, but if I increase the no. of clients, the server starts at random to close the TCP connections in the middle of the calls. Not all calls are interrupted this way.

That is really unexpected behaviour... I get no exceptions on the server side, just the client side exception:

System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host

Server stack trace: 
   ved System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   ved System.Runtime.Remoting.Channels.SocketStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   ved System.Runtime.Remoting.Channels.SocketHandler.ReadFromSocket(Byte[] buffer, Int32 offset, Int32 count)
   ved System.Runtime.Remoting.Channels.SocketHandler.Read(Byte[] buffer, Int32 offset, Int32 count)
   ved System.Runtime.Remoting.Channels.SocketHandler.ReadAndMatchFourBytes(Byte[] buffer)
   ved System.Runtime.Remoting.Channels.Tcp.TcpSocketHandler.ReadAndMatchPreamble()
   ved System.Runtime.Remoting.Channels.Tcp.TcpSocketHandler.ReadVersionAndOperation(UInt16& operation)
   ved System.Runtime.Remoting.Channels.Tcp.TcpClientSocketHandler.ReadHeaders()
   ved System.Runtime.Remoting.Channels.Tcp.TcpClientTransportSink.ProcessMessage(IMessage msg, ITransportHeaders requestHeaders, Stream requestStream, ITransportHeaders& responseHeaders, Stream& responseStream)
   ved System.Runtime.Remoting.Channels.BinaryClientFormatterSink.SyncProcessMessage(IMessage msg)

Exception rethrown at [0]: 
   ved System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   ved System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   ved EBH.GuG.AgentKit.Transports.RemotingAgentHostEndPoint.SyncInvoke(Agent a, Int32 port)