Menu
  Log out
 

Fix Rust 'Unacceptable Client Module Version' + EAC Errors (2026)

Rust Guide • Updated Jun 15, 2026

Rust Connection Errors: The Ultimate Fix Guide

Nothing is more frustrating than trying to join a server and getting kicked with "EAC Disconnected" or "Steam Auth Timeout". These errors can happen on both the client (your PC) and the server side.

Common Error Messages & Fixes

1. "EAC Disconnected" or "Easy Anti-Cheat Violation"

This means the anti-cheat system failed to verify your game files or connection.

Client Fix (Player)

  1. Close Rust completely.
  2. Go to your Rust installation folder: `\Steam\steamapps\common\Rust\EasyAntiCheat`.
  3. Run `EasyAntiCheat_Setup.exe` as Administrator.
  4. Select "Rust" and click "Repair Service".
  5. Restart your PC.

Server Owner Fix

Ensure your server files are up to date. Sometimes a server update corrupts EAC files.

Run `app_update 258550 validate` in SteamCMD to verify server integrity.

2. "Steam Auth Timeout"

This error occurs when the server cannot verify your Steam ID with Valve's master servers.

For Players:

  • Restart Steam: Log out and log back in. Steam's session token may have expired.
  • Check Steam Status: Is Steam down? Check steamstat.us.
  • Opt out of Steam Beta: Beta clients sometimes cause auth issues.

For Server Owners:

  • Update Server: An outdated server version will fail to authenticate newer clients.
  • Port Forwarding: Ensure the Steam Query Port (default 28016 or 28017 UDP) is open in your firewall.

3. "Packet Flooding: Player Tick"

Often caused by lag or bad internet connection, but can also be a server performance issue.

For Players:

  • Use a wired Ethernet connection instead of Wi-Fi.
  • Close bandwidth-heavy apps (Netflix, huge downloads).

For Server Owners:

If many players get this, your server might be overloaded.

  • Check CPU Usage: Are you hitting 100%? Upgrade your hosting plan.
  • Physics step: Sometimes `physics.steps` needs adjustment, but default is usually best.
  • DDOS Protection: Ensure you have robust DDoS mitigation.

General Troubleshooting Steps

If you still can't connect, try these universal fixes:

Verify Game Integrity (Client)

  1. Right-click Rust in Steam Library > Properties.
  2. Go to "Installed Files".
  3. Click "Verify integrity of game files".

Flush DNS (Client)

Open Command Prompt as Admin and type: `ipconfig /flushdns`

Reinstall Rust (Last Resort)

Sometimes a fresh install is the only way to fix deep corruption.

Running a server and tired of constant errors? Move to managed Rust hosting from Supercraft where our automated systems handle updates and integrity checks for you.

Tired of fighting this issue every patch?

Run a managed Rust server with us. We handle the patches, mod-version pinning, save backups, and DDoS protection. Set up in 3 minutes, 5 datacenter regions, no contract.

See Rust hosting plans →
← Back to Rust Guides
Top