How to start a chat (node.js, socket.io) on the website?

Try to run the chat example on the website socket.io.

server.js:

var express = require('express');
var app = express();
var server = app.listen(3000);
var io = require('socket.io')(server);

io.on('connection', function(socket){
socket.emit('an event sent to all connected clients');

console.log('a user connected');
socket.on('disconnect', function(){
console.log('user disconnected');
});
socket.on('chat message', function(msg){
io.emit('chat message', msg);
console.log('message:' + msg);
});
});

start:
node server.js &

netstat-lnp -t
tcp 0 0 0.0.0.0:3000 0.0.0.0:* LISTEN 9429/node

as far as I know - everything is normal, 3000 the port is listening.
try from a browser:
mydomen.com:3000
not loaded.
on the host - Service: Virtual server / OpenVZ
Where that not so?