Nodejs server not visible on lan - node.js

Question

I have installed a fresh CentOS 7 on my server and now I would like to run a nodejs server, but there is some problem I can't figure out. What I have is a simple nodejs server:
hello.js
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
}).listen(8080, "0.0.0.0");
console.log('Server running at http://0.0.0.0:8080/');
I have tried with .listen(8080); also .listen(80); no success with those as well.
The strange thing is that, I can access the server locally with curl localhost:8080 it works as expected. But when I try from another machine on the same network it doesn't work.
E.g.
The server ip is 192.168.2.136 when I try in my browser 192.168.2.136:8080 I get 192.168.2.136 refused to connect.
Just to clarify that I have setup my modem with DMZ to my server ip.
Here is also netstat -ntl output
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN
tcp6 0 0 :::22 :::* LISTEN
If someone can help with this would be great! thanks in advance!