What do you mean up manually put? Listening port is generally the same, however, if you're using UPnP then it doesn't matter.

Are you attempting to use UPnP or manual port forwarding? Are your devices manually port forwarded?

Did you see the link I gave which has a special section dealing with setting up UPnP on devices? There's one also for Airport except it's called (NAT-PMP).

If you already have a setting for gnutella/LW then you don't need to create a new one. See OSX Firewall settings which is for Tiger but there's not much difference.