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    <p>The trick is that you need to subscribe to the server's <code>connection</code> event which gives you the socket of the new connection. You need to remember this socket and later on, directly after having called <code>server.close()</code>, destroy that socket using <code>socket.destroy()</code>.</p> <p>Additionally, you need to listen to the socket's <code>close</code> event to remove it from the array if it leaves naturally because its keep-alive timeout does run out.</p> <p>I have written a small sample application you can use to demonstrate this behavior:</p> <pre><code>// Create a new server on port 4000 var http = require('http'); var server = http.createServer(function (req, res) { res.end('Hello world!'); }).listen(4000); // Maintain a hash of all connected sockets var sockets = {}, nextSocketId = 0; server.on('connection', function (socket) { // Add a newly connected socket var socketId = nextSocketId++; sockets[socketId] = socket; console.log('socket', socketId, 'opened'); // Remove the socket when it closes socket.on('close', function () { console.log('socket', socketId, 'closed'); delete sockets[socketId]; }); // Extend socket lifetime for demo purposes socket.setTimeout(4000); }); // Count down from 10 seconds (function countDown (counter) { console.log(counter); if (counter &gt; 0) return setTimeout(countDown, 1000, counter - 1); // Close the server server.close(function () { console.log('Server closed!'); }); // Destroy all open sockets for (var socketId in sockets) { console.log('socket', socketId, 'destroyed'); sockets[socketId].destroy(); } })(10); </code></pre> <p>Basically, what it does is to start a new HTTP server, count from 10 to 0, and close the server after 10 seconds. If no connection has been established, the server shuts down immediately.</p> <p>If a connection has been established and it is still open, it is destroyed. If it had already died naturally, only a message is printed out at that point in time.</p>
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