Without this, BattleEye rejects the HC, triggering a Steam Auth cascade failure.
The Steam authentication failed error in Arma 3 Headless Client has significant implications for gamers, server administrators, and developers:
Arma 3's Steam App ID is 107410 . The -steamport parameter forces the client to initialize the Steam API correctly on a specific port. If 2306 is busy, use 2307 or 2308 . Ensure this port is not the same as your server query port. arma 3 headless client steam authentication failed hot
Navigate to the root folder of your (the same folder where arma3.exe or arma3server.exe is located).
diag_log allClients;
100% solves Steam Auth Failed. Cons: Wastes a Steam login slot; Steam may prompt for offline mode periodically.
start /min "Headless Client" "C:\Program Files (x86)\Steam\steamapps\common\Arma 3\arma3.exe" -client -connect=127.0.0.1 -port=2302 -password=yourpassword -name=hc -nosound -nogrammar Without this, BattleEye rejects the HC, triggering a
Based on modern server hosting documentation from 2025-2026, the landscape of Arma 3 hosting has changed slightly, but the core authentication issue remains.
The Headless Client uses its own profile folder. If this profile has not explicitly accepted the anti-cheat license agreement, the connection drops. If 2306 is busy, use 2307 or 2308
Open your (or your server management tool like FASTER or TADST) and adjust the security arrays:
Steam not running or not logged in