Rust "Network error" Proton Easy anti cheat ERROR

[LoniDev1]

Compatibility Report

• Name of the game with compatibility issues: Rust
• Steam AppID of the game: 258550

System Information

• GPU: AMD Ryzen 5 5500U with Radeon Graphics
• Video driver version: 4.6 (Compatibility Profile) Mesa 25.2.8-0ubuntu0.24.04.2
• Kernel version: 6.8.0-136-generic
• Link to full system information report as Gist: https://gist.github.com/LoniDev1/67b76c0806ad7eb9e4e28efac5e1d25d
• Proton version: Proton Experimental, Proton 9.x, Proton 8.x, Proton Hotfix.

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

steam-252490.log

Symptoms

Starting causes:

Network Error:
No anticheat module has been found for this game and platform

(Facepunch or Valve has fixed this error before it worked like 10 months or 4 months ago, but with the release of the Steam Machine it would be nice if this could be fixed in any way)

Reproduction

Just Start Rust with probably any Proton version.

[kisak-valve]

Hello @LoniDev1, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to #3104 (comment).