First off, go to something like whatismyip.com to determine your IP address. See if it matches the IP address of your individual machine.

I'm betting it doens't. This is because the IP address that is public (the one that whatismyip.com was able to display) is the IP address of your router, not your computer. Your router shields your actual IP address from people attempting to access your computer to this. The solution to this is to not only open up port 6346-8, but to open those ports "to" your computer, by mapping them from your router to your computer and forwarding your NAT.