AuthTicketCanceled is a Steam-session authentication message. A single occurrence after a disconnect can be harmless, while repeated kicks can point to stale Steam state, damaged local files, network interruption, or a server-side environment that is repeatedly invalidating sessions. Diagnose whether the failure affects one player or many before changing the server.

Fix it step by step

1Determine whether the problem is one client or the whole server

Check the Rust server console and ask whether multiple players were disconnected at the same time. If many sessions fail together, investigate Steam availability, host networking, or server changes before modifying one player's PC.

2Restart Rust and Steam completely

Exit Rust, close Steam, and verify Steam is no longer running in Task Manager. Start Steam again, wait for it to sign in fully, then launch Rust from the Steam Library.

3Re-authenticate the Steam session

If the message repeats, sign out of Steam and sign back in. This creates a new authenticated session instead of reusing stale client state.

4Verify Rust files

Use Steam's Verify Integrity of Game Files feature. Facepunch recommends file verification for a range of Rust/EAC problems because missing or damaged files can produce misleading connection symptoms.

5Compare another server

Join a known working official or community server. If only one server produces the error, focus on that server's networking, updates, plugins, and host state rather than repeatedly changing the client.

6Review recent server changes

For a modded server, note plugin updates, restarts, SteamCMD updates, firewall changes, or proxy/network changes made just before the problem started. Disable or roll back only the most likely change and retest.

7Restart the server only after collecting evidence

A restart can clear stale service state, but capture the relevant log lines first. Otherwise the restart may hide the information needed to understand why authentication failed.

Frequently asked questions

Is AuthTicketCanceled a ban message?

No. It is an authentication/session message and does not, by itself, state that the account is banned.

Why can it appear after a reconnect?

Steam session tickets are tied to the active authenticated session. Rapid reconnects, Steam restarts, or network interruptions can invalidate previous session state.

Can a plugin be responsible?

A plugin can contribute to connection handling problems on a modded server, but first establish whether the same client can join other servers and whether multiple users are affected.

Official sources

These references were used to build and verify the troubleshooting order in this guide.

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