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POMultiple clients with Server Application more than 15 clients handling issue
 

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  1. POMultiple clients with Server Application more than 15 clients handling issue
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    <p>I have a Server Application written in C# .NET and running on Windows XP SP3.</p> <p>I am using asynchronous sockets programming for handling around 500 clients.</p> <p>But I got a problem to entertain more than 15 client connections.</p> <p>My application got shut down when 1 more client connected after 15 clients; I am not understanding whether the problem is with my OS or is a tcp connection limitation problem in Windows XP.</p> <p>Please help to solve out this issue, please suggest any solution.</p> <h3>Update:</h3> <p>Here is my piece of code. </p> <pre><code>public const int MAX_CLIENTS = 200; public AsyncCallback pfnWorkerCallBack; private Socket[] m_workerSocket = new Socket[MAX_CLIENTS]; // class for worker socket &amp; callback method &amp; data buffer private SocketPacket[] m_workerSocketPkt = new SocketPacket[MAX_CLIENTS]; // page Load m_mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint ipLocal = new IPEndPoint(IPAddress.Any, 4321); // Bind to local IP Address... m_mainSocket.Bind(ipLocal); // Start listening... m_mainSocket.Listen(MAX_CLIENTS); m_mainSocket.BeginAccept(new AsyncCallback(OnClientConnect), null); // called when client is connected public void OnClientConnect(IAsyncResult asyn) { try { m_clientCount = setclient(); SocketPacket abc = new SocketPacket(); m_workerSocketPkt[m_clientCount] = abc; //assigning with SocketPacket class m_workerSocketPkt[m_clientCount].m_currentSocket = m_mainSocket.EndAccept(asyn); //transferring connection to other thread m_workerSocketPkt[m_clientCount].m_clientCount = m_clientCount; m_workerSocketPkt[m_clientCount].templist = abcde; //assigning Amj (list) class m_workerSocket[m_clientCount] = m_workerSocketPkt[m_clientCount].m_currentSocket; pfnWorkerCallBack = new AsyncCallback(m_workerSocketPkt[m_clientCount].OnDataReceived); //defining AsynCallBack function for the accepted socket m_workerSocketPkt[m_clientCount].oldpfnWorkerCallBack = pfnWorkerCallBack; m_workerSocketPkt[m_clientCount].data_rec = false; m_workerSocketPkt[m_clientCount].data_sent = false; m_workerSocketPkt[m_clientCount].m_currentSocket.BeginReceive( m_workerSocketPkt[m_clientCount].dataBuffer, //assigning data buffer for receiving for the socket 0, //assigning data buffer offset for receiving for the socket m_workerSocketPkt[m_clientCount].dataBuffer.Length, //assigning maximum data length for receiving for the socket SocketFlags.None, //socket flags pfnWorkerCallBack, //AysnCallBack delegate m_workerSocketPkt[m_clientCount].m_currentSocket //state ); m_mainSocket.BeginAccept(new AsyncCallback(OnClientConnect), null); //start invitation for other new sockets } </code></pre> <p>The Max Client Value is here 200 and worker sockets also, so it should handle 200 clients but I think it's creating a problem in receiving data from more than 15 clients because every client that is connected is continuously connected and sends data to the server.</p>
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    1. USMichael Myers
    1. USamit jain
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    1. COThe error message? You may have hit the license limit for half-open connections and need to upgrade to Windows Server. Read this question for more details: http://serverfault.com/questions/51597/how-to-fix-tcp-ip-has-reached-the-security-limit-event-message
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      1. USSteve-o
    2. COSteve - unlikely IMHO. The half open connection limit is for outbound connections, not inbound and the issue occurs due to the RATE of new outbound connections being attempted, not the total number.
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      1. USLen Holgate
    3. COAs Peter says, it's most likely a bug in your server code; can you show us some code around the point where the server accepts new connections?
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      1. USLen Holgate
 

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