title: nodejs serve not working responding connection timesout
body: <p>I have this in my server.js :</p>
  
  <pre><code>var app = require('express')();
  var http = require('http');
  http.createServer(function(request, response) {
        response.writeHead(200, {"Content-Type": "text/plain"});
        response.write("It's alive!");
        response.end();
  }).listen(3000);
  </code></pre>
  
  <p>this works fine on local but not when I deploy it and try access to my <code>shared.domain.ma:3000</code> 
  In the client side I have a Websocket that trying to connect to my server in that address but it give me <code>net::ERR_CONNECTION_TIMED_OUT</code> ann I tried <code>curl</code> and the result is the same again
  - What could be reason of this problem?    </p>