Check if your Arma Reforger server is online
Unlike most games here, Reforger stays silent to this check until you have deliberately switched its query protocol on.
The ports Arma Reforger uses
A2S querying is off by default; you enable it in the server config and give it a port. Until you do, nothing is there to reply, however your router is set up. Reforger's query also leaves out the player list, so an online result shows the server but not who is on it.
Every port a default Arma Reforger install uses
With the game port left at 2001. If you changed it with bindPort in config.json, the other ports move with it.
| Port | What it is for |
|---|---|
| 2001 UDP | Game trafficRequired bindPort. Reforger ships with 2001, though most rented panels remap it — use whatever your config file actually says. |
| 17777 UDP | Steam queryRequired steamQueryPort, a fixed default that does NOT move with the game port. |
Still offline? Try this
Turn on A2S in the server configuration, restart, and forward the port you gave it. Leaving it off means nothing outside can confirm the server: the port tester on this page uses TCP and Reforger’s game port is UDP, so the only test left is a player joining from outside your network.
What a Arma Reforger server needs to run well
- Memory, 32 players
- 8 GB
- CPU cores
- 6+
- Disk
- 30 GB+
Enfusion parallelises better than Arma 3, so extra cores are genuinely used.