Thank you all for the help. The "Toasty Answers" was particularly helpful. I apparently had it up and running, but couldn't find it on my own home network (although I was using TCP, not UDP when setting up port forwarding). Even though it doesn't appear on my server list, I can connect to IP through the open game when I have the server running. My son was also able to connect using the connect to IP, but since we're both using the home network, neither of us could find it on the server list in-game.