Socket.io + Node.js + Apache

I have my app written in node on a Debian 7 server launched with forever and working with apache proxy via a url (without port like http.//subdomain.domain.com) with this config:

<VirtualHost *:80>
    ServerName subdomain.domain.com

    ProxyRequests off

    <Proxy *>
            Order deny,allow
            Allow from all
    </Proxy>

    <Location />
            ProxyPass http://localhost:8081/
            ProxyPassReverse http://localhost:8081/
    </Location>

 </VirtualHost>

The app is running ok but the problem comes with socket.io, I´m getting this error:

GET http://ift.tt/1L3AwIC net::ERR_CONNECTION_TIMED_OUT

This is my server.js:

var server = express.createServer();
server.configure(function(){
    server.set('views', __dirname + '/views');
    server.set('view options', { layout: false });
    server.use(connect.bodyParser());
    server.use(express.cookieParser());
    server.use(express.session({ secret: "ezdoknahi!!"}));
    server.use(connect.static(__dirname + '/static'));
});


server.configure('development', function(){
    server.use(express.errorHandler());
});

//setup the errors
server.error(function(err, req, res, next){
    if (err instanceof NotFound) {
        res.render('404.jade', { locals: {
                  title : '404 - Not Found'
                 ,description: ''
                 ,author: ''
                 ,analyticssiteid: 'XXXXXXX'
                },status: 404 });
    } else {
        res.render('500.jade', { locals: {
                  title : 'The Server Encountered an Error'
                 ,description: ''
                 ,author: ''
                 ,analyticssiteid: 'XXXXXXX'
                 ,error: err
                },status: 500 });
    }
});
server.listen( port);

//Setup Socket.IO
var io = io.listen(server);
io.sockets.on('connection', function(socket){
  console.log('Client Connected');
  socket.on('message', function(data){
//    socket.broadcast.emit('server_message',data);
//    socket.emit('server_message',data);
      console.log(data);
  });
  socket.on('disconnect', function(){
    console.log('Client Disconnected.');
  });
});


///////////////////////////////////////////
//              Routes                   //

And this is my client app (Angular.js):

produccionApp.factory('socket', function () {
    var socket = io.connect('http://192.168.1.1:8081');
    return socket;
});

(192.168.1.1 is my subdomain.domain.com IP Address (enterprise server))

In my localhost works perfectly (how not!) but in production not. I suspect the problem is connecting through apache proxy. How to solve it?

Thanks in advance

UPDATE:

I installed nginx 1.6 on this server ( Debian 7 ) and I configured like this:

server {
    listen 80;
    server_name subdomain.domain.com;

    access_log /var/log/nginx/subdomain.domain.com.log;
    error_log  /var/log/nginx/subdomain.domain.com.error.log;

    location / {
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header Host $http_host;
      proxy_set_header X-NginX-Proxy true;

      proxy_pass http://127.0.0.1:8081/;
      proxy_redirect off;

              proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
    }

}

And still the same error:

GET http://ift.tt/1L3AwIC net::ERR_CONNECTION_TIMED_OUT

I also tried to connect socket.io to http://ift.tt/1dTOlMV but still same error.

any help?