Minecraft Chain Error | Clear the Authentication Tokens

The “Minecraft Chain Error” is a broad term that most often refers to a breakdown in the authentication chain when the Minecraft Launcher or client tries to verify your ownership via Microsoft services.

The most common specific issue associated with the word “chain” is the Mojang Token Service or Keychain Access error, particularly on Mac, but the troubleshooting steps apply to general login/session errors on any platform.

Here is a breakdown of the easy fixes for Minecraft chain and authentication errors:

🔑 Fix 1: Clear the Authentication Tokens (Common on Mac)

This is the most direct fix if you are getting repeated sign-in prompts or an authentication loop.

• For Mac Users (Keychain Access):

  • Open Keychain Access (Search for it in your Spotlight/Launchpad).

  • In the left-hand panel, ensure you are under “login” (not iCloud).

  • In the search bar, type MojangTokenService.

  • Right-click and delete ALL entries labeled MojangTokenService.

  • Restart the Minecraft Launcher and sign in again with your Microsoft Account. This forces the system to generate a fresh, non-corrupted token.

• For Windows Users:

  • Sign out of the Minecraft Launcher.

  • Sign out of the Xbox App and the Microsoft Store (if you are signed in there).

  • Restart your PC to clear cached session data.

  • Relaunch the Minecraft Launcher and sign in.

🔄 Fix 2: Session and Network Refresh

If the issue is intermittent (e.g., “Invalid session,” “Cauldron Error Code,” or “Creeper Error Code”), it is usually a temporary break in the connection to the authentication servers.

• Sign Out and Sign In: In the Minecraft Launcher, explicitly sign out of your Microsoft Account, then sign back in. This requests a fresh “session ID” from the server.

• Restart Everything: Fully close the Minecraft Launcher and the Minecraft client. Wait 30 seconds, then reopen and try again.

• Check Connection Stability: If the error is network-related (like the Creeper Code), ensure your internet connection is stable and try a quick power cycle of your router/modem.

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🛡️ Fix 3: Conflict Checks

Certain programs or settings can block the necessary authentication handshake.

• Firewall/Antivirus: Temporarily disable your third-party antivirus/firewall to see if it is blocking the connection between Minecraft and the Microsoft/Mojang servers. If this fixes it, you need to add an exception for the Minecraft Launcher and javaw.exe.

• VPN/Proxy: If you are using a VPN or proxy, turn it off and try connecting again, as it can confuse the authentication server about your location.

• Run as Administrator (PC): Right-click the Minecraft Launcher icon and select “Run as administrator.”

If none of these common fixes resolve the “chain error,” it’s best to consult the Minecraft Help Center or contact Microsoft Support directly, as the issue may be tied to a specific problem with your migrated Microsoft Account.