Intraman,

I think the problem the user is ahving is connecting behind a router, so which ever set up you go for you will still have problems.

To the question,
For your router you should have some kind of control pannel, what you need to do is find the options for port forwarding, fill in the port your application uses and then the local ip of the machine behind the router. All that will happen then is when your router getsb a request on that port (because all data goes to the router first) it will forward it to the selected machine Ip.

If you need any more help just let me know