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    <p>In your server side code you are only calling <code>Read()</code> once, but you can't assume the data will be available when you call read. You have to continue reading in a loop until no more data is available. See the full example below.</p> <p>I have tried to reproduce your issue with the minimal amount of code and was not able to. The server prints out the clients message everytime. No special settings such as <code>NoDelay</code> and no explicit <code>Close()</code> or <code>Flush()</code>, just <code>Using</code> statements which ensures all resources are properly disposed. </p> <pre><code>class Program { static int port = 123; static string ip = "1.1.1.1"; static AutoResetEvent waitHandle = new AutoResetEvent(false); static void Main(string[] args) { StartServer(); waitHandle.WaitOne(); for (int x=0; x&lt;1000; x++) { StartClient(x); } Console.WriteLine("Done starting clients"); Console.ReadLine(); } static void StartClient(int count) { Task.Factory.StartNew((paramCount) =&gt; { int myCount = (int)paramCount; using (TcpClient client = new TcpClient(ip, port)) { using (NetworkStream networkStream = client.GetStream()) { using (StreamWriter writer = new StreamWriter(networkStream)) { writer.WriteLine("hello, tcp world #" + myCount); } } } }, count); } static void StartServer() { Task.Factory.StartNew(() =&gt; { try { TcpListener listener = new TcpListener(port); listener.Start(); Console.WriteLine("Listening..."); waitHandle.Set(); while (true) { TcpClient theClient = listener.AcceptTcpClient(); Task.Factory.StartNew((paramClient) =&gt; { TcpClient client = (TcpClient)paramClient; byte[] buffer = new byte[32768]; MemoryStream memory = new MemoryStream(); using (NetworkStream networkStream = client.GetStream()) { do { int read = networkStream.Read(buffer, 0, buffer.Length); memory.Write(buffer, 0, read); } while (networkStream.DataAvailable); } string text = Encoding.UTF8.GetString(memory.ToArray()); Console.WriteLine("from client: " + text); }, theClient); } } catch (Exception e) { Console.WriteLine(e); } }, TaskCreationOptions.LongRunning); } } </code></pre>
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    1. POTcpClient.Close() works only with Thread.Sleep()
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    1. COCan you try to minimize sleep between clients running? I've catching more crashes with many clients running at the same time. Also, you runs clients one by one, I've running several clients at the same time. But anyway, it's strange. I will try to reproduce this bug on another computer. May be it is some local computer bug ..
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    2. CO@VorobeY1326 I've updated the example to queue 1000 clients onto the thread pool at once. From the output, it looks like all 1000 clients get to the server and are printed out.
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    3. COyou code works well on my computer. No exceptions. Thanks for it, I'll try found out, what's the difference between yours code and mine and write about it later.
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