The client or the server can manage a connection. If you manually manage port forwarding for the server, you'll need to forward ports 8000-8002 for UDP traffic on the server network. If you would like to invite others to join your gaming session, you need to increase the ports forwarded by 3 for each concurrent connection. For instance, if you have 5 friends connecting to your server, you should forward ports 8000-8014. Once you forward those ports for UDP traffic on your router, add this line to your server settings or change it on your networking settings tab on the app.