Quick answer: "Disconnected: EAC" = Easy Anti-Cheat issue on client or server not EAC-compatible. Verify Rust files in Steam, don't disable EAC, update server.
If you landed here: Instant kick on join with EAC message, "Authentication timed out" or "EAC: Invalid connection".
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Frequently asked questions (FAQ)
Rust EAC disconnected – what to do?
Easy Anti-Cheat must be active on client (Steam starts EAC automatically). Repair EAC files: Steam → Rust → Properties → Local files → Verify integrity.
Can I disable EAC on server?
Only for private modded servers without vanilla clients. Standard Rust dedicated needs EAC. +server.secure 1 in cfg.
EAC error after server update?
Validate server via SteamCMD (app 258550). Update Oxide/uMod after Rust patch. Client and server on same version.