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Fix Halo MCC Campaign Co-op Disconnects on Linux

Game: Halo: The Master Chief Collection
Platform: Steam / Linux
Working Proton Version: 7.0-6

The Problem​

While playing Halo: Reach campaign co-op between two Linux computers, both players were disconnected and returned to the lobby approximately 30 seconds after starting.

Both computers were using Proton Experimental.

The Fix​

Switch both computers to Proton 7.0-6.

  1. Open Steam Library.
  2. Right-click Halo: The Master Chief Collection → Properties.
  3. Select Compatibility.
  4. Enable Force the use of a specific Steam Play compatibility tool.
  5. Select Proton 7.0-6.
  6. Repeat on the other computer and restart the game.

Results​

Proton VersionResult
Proton ExperimentalDisconnected after ~30 seconds
Proton 7.0-6Co-op worked

Conclusion: Proton 7.0-6 resolved our Halo: Reach campaign co-op disconnections on Linux. No additional configuration or launch options were required.