[Scott]

Two things could be the issue here. If you're on a wifi network you can't control, odds are there is a firewall on the router blocking incoming traffic. You'd need access to open the game ports so you can forward them to the server.

Second problem is if you're on the same network with one server and one gaming pc while trying to join from novaworld using your public IP address. The server and gaming pc will attempt to use the same ports, so when your server sends packets to your client, your router will actually try and attempt to route them back to the server so your client will never receive the server packets. The fix for this would be to create a custom startup file that uses the servers LAN ip to connect. Some routers don't seem to have a problem with this, but many seem to.