Make sure you set forward Ports 18887 – 18903 on your network to Open. If blocked, you will see periodic disconnections or failures to enter the world.

If you receive this message, follow the steps to Repair Service for EAC.

To repair Easy Anti-Cheat:

1. Open the Lost Ark Application in your Steam library.

2. Open Settings, select Manage, and then Browse Local Files.

3. Go to Steam > steamapps > common > Lost Ark > Binaries > Win64 and open the EasyAntiCheat folder.

4. Right click the EasyAntiCheat_Setup.exe file, and select Run as administrator.

5. Select Current game, if it's not the default option, and then select Repair Service.

Check for Windows updates

To learn more about how to check for Windows updates, go to Microsoft Support.

To learn how to verify your game files, go to Steam Support.

Try scanning for malware. Malware can cause many adverse effects on your computer. These effects vary widely depending upon the type and purpose of the malware. High resource usage can be one of the symptoms, which directly impacts your gaming experience. If you have your own preferred anti-virus or anti-malware software, use it to scan your computer.

Errors with EAC can occur due to a virus infection on your system. Performing a full-system scan can help identify if there is an issue with your anti-virus. If your full system scan doesn't provide any results, ensure your anti-virus or other software is not falsely blocking Easy Anti-Cheat

1. Close all open programs, including Lost Ark and Steam.

2. Select the Windows button, and then the power button.

3. Select Restart.