Quick Summary
The 'MOJANG_AUTH_ERROR' indicates a problem with your Minecraft account's authentication with Mojang's servers. This typically means that the game is unable to verify your ownership of Minecraft or that there is an issue with your login credentials.
Common Causes
- Incorrect Login Credentials: The username (email) or password entered is incorrect.
- Internet Connection Issues: A weak or unstable internet connection can prevent the game from properly authenticating with the Mojang servers.
- Mojang Server Outage: Mojang's authentication servers might be temporarily unavailable due to maintenance or other technical issues.
- Outdated Game Launcher: An outdated Minecraft Launcher can sometimes cause authentication problems.
- Corrupted Game Files: Damaged or corrupted game files can interfere with the authentication process.
- Firewall/Antivirus Interference: Firewall or antivirus software might be blocking the Minecraft Launcher from connecting to the internet.
- Migration Issues: Older Minecraft accounts purchased before November 2012 might need to be migrated to a Mojang account.
Step-by-Step Fixes
Method 1: Verify Login Credentials
Step 1: Double-check your username (email address) and password.
Step 2: Ensure that Caps Lock is off.
Step 3: If you've forgotten your password, use the "Forgot Password" option on the Minecraft website to reset it.
Method 2: Check Internet Connection
Step 1: Make sure you have a stable internet connection. Test your connection by browsing other websites.
Step 2: Restart your router and modem.
Step 3: If using Wi-Fi, try switching to a wired connection.
Method 3: Check Mojang Server Status
Step 1: Visit the official Mojang server status page (status.minecraft.net) to check for known outages.
Step 2: If there is an outage, wait for Mojang to resolve the issue.
Method 4: Update Minecraft Launcher
Step 1: Close the Minecraft Launcher.
Step 2: Re-open the Launcher. It should automatically check for and install updates.
Step 3: If the Launcher doesn't update automatically, download the latest version from the Minecraft website and reinstall it.
Method 5: Restart the Minecraft Launcher
Step 1: Close the Minecraft Launcher completely.
Step 2: Wait a few seconds.
Step 3: Re-open the Minecraft Launcher.
Step 4: Try to log in again.
Method 6: Clear Minecraft Launcher Data
Step 1: Close the Minecraft Launcher.
Step 2: Press the Windows key + R, type %appdata%/.minecraft and press Enter.
Step 3: Rename the entire '.minecraft' folder to '.minecraft_backup'.
Step 4: Re-open the Minecraft Launcher. This will create a new .minecraft folder.
Note: This will reset your game settings, so you may want to back up specific files (like 'options.txt' or 'saves') from the original folder before renaming it.
Method 7: Check Firewall/Antivirus Settings
Step 1: Check your firewall and antivirus software settings.
Step 2: Ensure that the Minecraft Launcher and Java are allowed access to the internet.
Step 3: Temporarily disable your firewall/antivirus software to see if that resolves the issue (remember to re-enable it afterward).
Method 8: Migrate Your Account (If Applicable)
Step 1: If you purchased Minecraft before November 2012, visit the Mojang website.
Step 2: Follow the instructions to migrate your account to a Mojang account.