Connect on the game port 2001, not the query port 17777
#join on 2001, not 17777#bind versus public
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Two server appids
Firewall rules · Arma Reforger
Bohemia military sim · Military simulation / tactical
Player tools indexed: 5
Admin consoles: 7
No 19999 rule unless RCON is enabled
Player tools (5)
Instant interactive calculations and recipe plannersCovers a wrong publicAddress, BattlEye and the RCON version risk
#the RCON version risk#a wrong publicAddress
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No official server spec was published; only verifiable upstream defaults are registered
#no official server spec#maxFPS defaults to 60 upstream
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The stable and experimental servers plus the template schema evolution
#stable and experimental appids#the template schema evolution
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The mods array and GUID+path validation for scenarioId
#scenarioId shape validation#mods and addonsVerify
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Server admin and config generation (7)
Config files, startup scripts and command wizards for running a servermaxPlayers defaults to 64 while a real host uses 128; no official upper bound
#default 64, a real host uses 128#no official upper bound
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Three ports, the bind/public pair and command-line overrides side by side
#three independent ports#two settings forms side by side
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No 19999 rule unless RCON is enabled
#no rule unless RCON is on#restrict the source
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Switch between stable 1874900 and experimental 1890870
#1874900 and 1890870#native on both platforms
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The AMP and LinuxGSM command lines side by side and switchable
#the AMP and LinuxGSM sets#shutdown with #shutdown
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48 keys merged from five sources, schema chosen by template version
#48 keys graded from five sources#schema chosen by version
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Two readings of RCON side by side; each of the three credentials emits a placeholder only
#BattlEyeRCON on 19999#three separate credentials
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Arma Reforger Ports & Protocols
| Port | Protocol | Purpose |
|---|---|---|
| 2001 | UDP | The game port and the one players connect to; bindPort is the local listener while publicPort is what gets advertised (they differ behind NAT) |
| 17777 | UDP | The Steam A2S query port, not a join port; gamedig distinguishes port from port_query explicitly |
| 19999 | UDP | The RCON port; AMP points AdminPortRef at it and sets AdminMethod to BattlEyeRCON. In the LGSM official config rcon is an empty object, i.e. not configured by default |
FAQ
- Which Arma Reforger server-admin tools are available?
- We list 7 tools for Arma Reforger: Capacity and performance budget, Port matrix, Firewall rules, Install and deploy, Launch parameters, serverconfig.json generator, RCON and administrators. All of them run straight in your browser.
- Which ports does Arma Reforger need open?
- Arma Reforger defaults to 2001/UDP, 17777/UDP, 19999/UDP. Use the actual instance configuration and allow only the listed protocols and ports. Check the host firewall, router forwarding and game visibility settings.
- How do I install a dedicated Arma Reforger server?
- Install it with SteamCMD — the dedicated server app id for Arma Reforger is 1874900, so +app_update 1874900 validate downloads or updates it. Config files usually live at Configs/serverconfig.json, AReforgerMaster/, profiles/server/.
- Do these tools cost anything or need installing?
- No. Everything runs in the page: no install, no sign-up, no cost. Enter your values and the result appears instantly, and you can copy the generated configs and commands with one click.