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
Arma Reforger workshop
Bohemia military sim · Military simulation / tactical
Player tools indexed: 5
Admin consoles: 7
Arma Reforger hosting in short: an Enfusion-engine dedicated server with two separate appids - the stable 1874900 (Arma Reforger Server) and the experimental 1890870 (Arma Reforger Experimental Server). Both are native on Windows and Linux, need no Wine, and are fetched with an anonymous SteamCMD login (their depot contexts are the base games 1874880 and 1890860). The three ports are independent: UDP 2001 is the game port that players connect to, UDP 17777 is the Steam A2S query port and not a join port, and UDP 19999 is the RCON port (AMP sets AdminMethod to BattlEyeRCON and AdminPortRef to it). The config file is Configs/serverconfig.json (a single JSON file), while the profile directory differs by upstream: AReforgerMaster for AMP and profiles/server for LinuxGSM. Whether RCON is on by default has two readings - the AMP template carries a full rcon block while the LGSM official config repo has rcon as an empty object - so the generator here only emits that block when you tick it explicitly. Keep the three credentials apart: rcon.password for remote administration, game.passwordAdmin as the in-game administrator password, and game.admins as an array of SteamID64 values. The official hosting documentation ships inside the server package at docs/ServerHostingDocs.bat (config.launch of both appids points there); the bistudio hosting wiki was blocked by Cloudflare this round (403), the official marketing site carries no hosting docs, and only its news/changelog pages were readable. The current stable release corresponds to 1.8.0.13 (announced 2026-09-03 11:58 UTC, 23 minutes after the server branch build stamp).
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.