FORCING A UDP PORT
Starting with v.92, it’s possible to force the game to use a particular UDP port when hosting/joining multiplayer games (from the main menu, choose Options → Network). This option is meant to help players with “Port-restricted cone” or “Symmetric” NATs.
Only change this setting if you know what you are doing. Improper values may crash the game, or prevent you from playing multiplayer games altogether.
Note that simply setting this option will absolutely not help you connect any better. You must also perform manual configuration on your router. Specifically, you need to do two things:
- Static IP : Ensure that your computer is always receiving the same IP from your router’s DHCP.
- Port-forwarding : Set up a rule to forward any UDP traffic from the internet to your local IP and game port.
The process to do this depends on your router, so you’ll need to consult your manual.