The Error Code 401 message is displayed in the following situations.
■ Causes of Error Code 401
- If an abnormal game login attempt or device environment is detected
- If your device is missing a SIM card
- If your device is not in the Korean time zone (code)
- If you used an external program to run the game
- If your device doesn't meet the minimum specifications
If possible, please close all external programs before using the game.
We also recommend using the game in a stable network environment.
■ How to Create a Stable Network Environment
- Please change the time of your device to Korean time.
- If you are using a VPN, please disconnect it before using the game.
- Check your browser version and update it to the latest version.
- If you're using a wireless network (Wi-Fi, hotspot, tethering, etc.) on your computer, please use it in an Ethernet environment.
- If both wired and wireless Internet connections are enabled on your computer, please turn off the wireless Internet.
┗ Settings > Network & Internet > Change adapter options.
┗ Change Wireless Internet (Wi-Fi) to Disabled.