Get Node js Server Url

I am new to node.js. I just installed node.js on my production server it was installed correctly and node.js is running on my putty cli the problem is I cannot access it on my browser. I think my problem is because I installed created my server on a subdirectory inside a subdomain e.g. subdomain.example.com here is my code

                var http = require('http');

                //create a server object:
                http.createServer(function (req, res) {
                  res.write('Hello World!'); //write a response to the client
                  res.end(); //end the response
               }).listen(3000); //the server object listens on port 8080

Now I am trying to access the node.js server by going to this address subdomain.example.com:3000 but I am getting no results. Please help Thanks!

via user3177305