Headless Client Steam Authentication Failed Hot — Arma 3

Arma 3 Headless Client: Fixing the "Steam Authentication Failed" Error (The "Hot" Fix Guide)

1. Check versions.
2. Check ports.
3. Check the HC password in server.cfg.

Use SteamCMD or Steam’s “remember me” on login

If your server doesn't explicitly allow the IP address of your Headless Client, the Steam authentication will often fail or time out. You must verify these settings in your server.cfg : arma 3 headless client steam authentication failed hot