TCP/UDP = 27015
srcds.exe -console -game gesource +map ge_runway +maxplayers 16
Rule Name Protocol Port Start Port End Port MapHalf Life II UDP 1200 1200 1200Half Life II UDP 2700 2700 2700Half Life II TCP/UDP 27015 27015 27015Half Life II TCP/UDP 27020 27020 27020Half Life II TCP 27021 27050 27021