title: node.js server.listen on a specific IP address EADDRNOTAVAIL
body: <p>When I try to listen on a specific IP address, I am getting an error.</p>
  
  <pre><code>var http = require('http');
  
  http.createServer(function (req, res) {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end('Hello World\n');
  }).listen(8080, "10.211.56.1");
  
  console.log('Server running at http://10.211.56.1:8080/');
  </code></pre>
  
  <p>I get the following error:</p>
  
  <pre><code>➜  node-test  sudo node server.js
  Server running at http://10.211.56.1:8080/
  events.js:85
        throw er; // Unhandled 'error' event
              ^
  Error: listen EADDRNOTAVAIL
      at exports._errnoException (util.js:746:11)
      at Server._listen2 (net.js:1139:19)
      at listen (net.js:1182:10)
      at net.js:1280:9
      at dns.js:85:18
      at process._tickCallback (node.js:355:11)
      at Function.Module.runMain (module.js:503:11)
      at startup (node.js:129:16)
      at node.js:814:3
  </code></pre>