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Hytale Authentication Failed Fix - Hytale Wiki

Hytale Guide • Updated Jan 15, 2026

Hytale Authentication Failed: Fix Login and Server Auth

Authentication errors usually mean the account is not verified, the server is not authorized, or the auth token expired. This guide fixes both player login errors and dedicated server auth failures.

Common Errors

Error Cause Fix
Authentication failed Account not verified or token expired Verify email and re-login
Server not authorized Device auth not completed Run device login in server console
Invalid session System clock out of sync Sync time and retry

Step-by-Step Fix

  1. Verify the player account. Confirm email verification or follow Verification Email Not Arriving.
  2. Re-authorize the server. In the server console, run:
/auth login device

Then enter the code at accounts.hytale.com/device.

  1. Check auth mode. Ensure the server launches in authenticated mode:
java -jar HytaleServer.jar --assets Assets.zip --auth-mode authenticated
  1. Sync the server time. Tokens fail if the system clock is wrong. Sync NTP and retry.
  2. Re-login the CLI. If you use the downloader CLI, remove old sessions and sign in again (see Downloader CLI Guide).

Note: If you switch to offline auth mode for testing, remember to restore authenticated mode before opening the server to the public.

Need stable auth handling? Host your Hytale server with Supercraft for managed auth workflows and monitored uptime.

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