Help

Hi, im just wondering if anyone can help or if anyone has had experince with this before. Ive just set up a simple Adhoc wireless network between two Pc`s, everything works fine with the exception of one thing. Both pcs can share the internet fine with no problems however when it comes to using file sharing programs particularly Edonkey and Overnet only the computer which has a `physical` connection to the internet will list the programs as having `open or reachable` ports. The computer that connects to the internet via the wireless network always remains `unreachable or closed`. I do have Norton firewall on both machines but have disabled both of them to test. Even with both disabled the comp liniked by wireless network still stays `closed`. The main pc works fine however. Any one have any ideas or suggestions as to how i can get around this as the programs dont work any where near as well as they should (they need open ports)
Look forward to hearing from anyone. Thanks