"C:\PathToArma3\arma3_x64.exe" -client -connect=127.0.0.1 -port=2302 -password=password123 -nosplash -name=HC1 3. Log Out and Re-log into Steam
If the error persists after whitelisting the HC in the server.cfg , you may need to apply more advanced solutions that target the Steam client's authentication service. arma 3 headless client steam authentication failed hot
