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    <p>In almost all cases you are supposed to call <code>Shutdown</code> on a <code>Socket</code> or <code>TcpClient</code> before disposing it. Disposing rudely kills the connection.</p> <p>Your code basically contains a race condition with the TCP stack.</p> <p>Setting <code>NoDelay</code> is also a fix for this but hurts performance. Calling <code>Flush</code> IMHO still results an an disorderly shutdown. Don't do it because they are just hacks which paint over the problem by hiding the symptoms. Call <code>Shutdown</code>.</p> <p>I want to stress that <code>Shutdown</code> being called on the <code>Socket</code> is the <strong>only</strong> valid solution that I know of. Even <code>Flush</code> just forces the data onto the network. It can still be lost due to a network hickup. It will not be retransmitted after <code>Close</code> has been called because <code>Close</code> is a rude kill on the socket.</p> <p>Unfortunately <a href="http://support.microsoft.com/kb/821625" rel="nofollow noreferrer">TcpClient has a bug</a> which forces you to go to the underlying Socket to shut it down:</p> <pre><code>tcpClient.Client.Shutdown(); tcpClient.Close(); </code></pre> <p>According to Reflector, if you have ever accessed <code>GetStream</code> this problem arises and Close does not close the underlying socket. In my estimation this bug was produced because the developer did not really know about the importance of <code>Shutdown</code>. Few people know and many apps are buggy because of it. <a href="https://stackoverflow.com/questions/425235/how-to-properly-and-completely-close-reset-a-tcpclient-connection">A related question.</a></p>
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    1. POTcpClient.Close() works only with Thread.Sleep()
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    1. COThere is no `Shutdown` on a TcpClient, there is only `Close`?
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    2. COPlease see the updated answer. I did further research. It actually explains the symptoms of the question perfectly.
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    3. CO@Usr from the MSDN article about the bug it says `To resolve this problem, close the associated NetworkStream object that the TcpClient GetStream method returns.` Which the OP is doing, so there is no need to call `ShutDown()`
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