Game

Arma Reforger

Bohemia's Enfusion-engine military sim, and its dedicated server.

Game port: 2001/udp (bindPort, publicPort)
Query port: 17777/udp (Steam / A2S)
RCON port: 19999/udp, disabled unless configured
Config file: config.json, passed to the server binary

Guide26 August 20264 min

Which ports an Arma Reforger server actually needs open

Three UDP ports, only one of which is mandatory. What each one does, what breaks when it is closed, and why the symptoms look nothing like a firewall problem.