Ports

Game Port Default: 7777 UDP Handled by: LinuxServer-KFEngine.ini Query Port Default: 27015 UDP Handled automatically or handled by parameters. Formula for finding query port assigned automatically is 19238 + assigned game port. Web Admin Default: 8080 TCP Handled by: KFWeb.ini Steam Port Default: 20560 UDP Handled automatically. Formula for finding steam port is 12783 + assigned game port.

Resources

​Killing Floor 2 Offical Server Wiki​