What could be the cause of my problem (Network)?

[silvercover]

Hi,

I have a simple Client/Server application and it works perfect in our LAN and home network. but when I try to test it through internet and set server internet IP I get error on connection and it seems my app is unable to reach server. what could be the cause of problem? Is that related to firewalls? IPs must be valid or what?

You know some ISPs assign some invalid or generic IP addresses in which when I investigate my own IP, I just get country and not my city and other details.

Thanks.

[Michael Vogel]

I would check the internet connection from both sides, server and client and, id the client is able to reach the server (by using a ping or a available service, like HTTP). If this works, you should check, your application, if there's a programming issue or you are using services (ports), blocked by a firewall (close ti your client or server).
Be sure, you need to search around your environment, ISP's won't give you illegal addresses....

[HeX0R]

You have to make sure, that your used port can reach the client.
Usually you have to do a port-forwarding inside your router.