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PODuplex named pipes - maximum number of clients on a single pipe
 

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    <p>Using the code from this answer - <a href="https://stackoverflow.com/questions/16432813/async-two-way-communication-with-windows-named-pipes-net">Async two-way communication with Windows Named Pipes (.Net)</a> - I'm finding the maximum number of connections/clients at any one time is 10.</p> <p>In the crude example below (this uses multiple threads - same thing happens if multiple processes are used) clients 1 to 10 will start and run as normal. However clients 11 and 12 will block when 'ProcessData' is called, eventually throwing a TimeoutException.</p> <pre><code> public static void Start() { // Start Server new Thread(new ThreadStart(Server.MainRun)).Start(); // Start Clients for (int i = 1; i &lt;= 12; i++) { Thread.Sleep(500); Client c = new Client(i.ToString()); new Thread(new ThreadStart(c.Run)).Start(); } } // Create a contract that can be used as a callback public interface IMyCallbackService { [OperationContract(IsOneWay = true)] void NotifyClient(); } // Define your service contract and specify the callback contract [ServiceContract(CallbackContract = typeof(IMyCallbackService))] public interface ISimpleService { [OperationContract] string ProcessData(); } [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] public class SimpleService : ISimpleService { public string ProcessData() { // Get a handle to the call back channel var callback = OperationContext.Current.GetCallbackChannel&lt;IMyCallbackService&gt;(); callback.NotifyClient(); return DateTime.Now.ToString(); } } class Server { public static void MainRun() { // Create a service host with an named pipe endpoint using (var host = new ServiceHost(typeof(SimpleService), new Uri("net.pipe://localhost"))) { host.AddServiceEndpoint(typeof(ISimpleService), new NetNamedPipeBinding(), "SimpleService"); host.Open(); Console.WriteLine("Simple Service Running..."); Console.ReadLine(); host.Close(); } } } class Client : IMyCallbackService { string _id; public Client(string ID) { _id = ID; } public void Run() { Console.WriteLine("Starting client : " + _id); // Consume the service var factory = new DuplexChannelFactory&lt;ISimpleService&gt;(new InstanceContext(this), new NetNamedPipeBinding(), new EndpointAddress("net.pipe://localhost/SimpleService")); var proxy = factory.CreateChannel(); Console.WriteLine(proxy.ProcessData()); Console.WriteLine("Client finished : " + _id); } public void NotifyClient() { Console.WriteLine("Notification from Server"); } } </code></pre> <p>If the client closes the channel when done (factory.Close()) then all clients will be able to run.</p> <p>I understand this question - <a href="https://stackoverflow.com/questions/1266849/number-of-clients-that-can-connect-to-a-named-pipe">Number of Clients that can connect to a Named Pipe</a> - is very similar but suggests there is no low limit.</p> <p>This suggests the limit is 10 on Windows XP and 2000 machines - <a href="http://msdn.microsoft.com/en-us/library/system.io.pipes.namedpipeclientstream.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/system.io.pipes.namedpipeclientstream.aspx</a> - except this is happening on a Windows 8 machine and Windows 2008 server.</p> <p>Is there a way to change this limit? Am I missing something obvious?</p>
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