VB6 - DirectPlay - problem is: can't find sessions from the internet (by TCP/IP)

Hello, I am trying to create a LAN / Internet racing game, so people can compete each other. I am using DirectX for the game - so I use DirectPlay for the LAN / Internet communication (by Internet TCP/IP Connection).

After some tests that I have done, I found out that the game doesn't find sessions that are not in the local LAN (which means they are from the internet), the game locates the sessions fine when they are from the LAN.

I searched in the internet about that problem, but I haven't found anything about it.

I would be glad if you will help me to solve it, here is the download link for the game and it's source code:

http://rapidshare.com/files/84809644...ource.rar.html

The game is in a very first alpha version, most of it's animations are still taken from the VB book I used to make this game.