Kicked from server: Steam authentication failed error


I just finished building my new PC and installed Insurgency Sandstorm. Ever time I join a server, I get kicked pretty much instantly with the error message: "Kicked from server: Steam authentication failed" I have tried everything including;

  • Steam: flushed cache, reinstalled
  • Uninstalled and reinstalled game
  • Checked if files are corrupted (verified game integrity)
  • It's not my firewall (ran machine on DMZ, disabled firewall)
  • It's not any antivirus or security settings (none present but Windows Defender on test machine, disabled it)
  • Connection is fine (every other game, including others on Steam and using EAC work fine)

Nothing has solved the issue. Any help would be greatly appreciated!

Hello @Pijns,

Can you try one of the steps below to see if that helps?


  1. Close Steam.
  2. Navigate to Steam > bin and copy the steamservice.dll file.
  3. Navigate to Program Files (x86) > Common Files > Steam.
  4. Paste and replace the steamservice.dll file.
  5. Run Steam and test.


  1. Close Steam.
  2. Open the Steam folder.
  3. Right click on the Steam.exe application > Properties.
  4. Click on the Compatibility tab.
  5. Check Run this program as an administrator and click OK.
  6. Run Steam and test.