Lost Ark: How to Fix “Authentication Failed Error 10010” Issue

A quick summary of possible methods to fix the Authentication Failed Error 10010 issue:

• Verify Integrity of Game Files on Steam
• Disable Internet Protocol Version 6
• Refresh Game Credentials
• Re-link your Twitch & Steam Accounts
• Mobile Internet & VPN
• Disabling your Antivirus Program Temporarily

Disclaimer: I am, the author of this guide, not responsible for any problems that might suddenly appear after you tried any of those suggested methods!

The easiest thing you can do is verifying the game files via Steam.

1. Open Steam
2. Go to the Library
3. Select Lost Ark
4. Right click and go to Properties
5. Select Local Files
6. Click Verify the integrity of game files
7. Let the process go through – this might take a couple of minutes
8. Launch the game & see if it worked

This option is only availabe for those who have a Twitch & Amazon account

1. Go to Amazon Games[www.amazongames.com]
2. Unlink your Steam account
3. Go to Lost Ark Twitch Drops[www.playlostark.com]
4. Unlink your Steam account
5. Re-Link your accounts again on each website
6. Restart Steam
7. Launch the game & see if it worked

This option is only availabe if you have a 3rd party Antivirus Program installed & running

A solution that sounds pretty weird and suspicious is temporarily disabeling your Antivirus Program right before you launch Lost Ark via Steam.

1. Deactivate your Antivirus Program
2. Launch Lost Ark
3. Let it load until you’re able to choose a server
4. Start your Antivirus Program again

1. Press Windows Key + R
2. Type ncpa.cpl in the searchbar
3. Right click on Network
4. Go to Properties
5. Uncheck Internet Protocol Version 6
6. Save changes
7. Launch the game & see if it worked

1. Open Windows Search and type cmd
2. Run the command prompt as administrator
3. Type ipconfig /flushdns & press enter
4. Type ipconfig /registerdns & press enter
5. Type ipconfig /release & press enter
6. Type ipconfig /renew & press enter
7. Type netsh winsock reset & press enter
8. Restart your computer
9. Launch the game & see if it worked

Wait inbetween each command for a few seconds

This option is only availabe if you have a VPN or can setup a mobile hotspot

Some people claim that using Mobile Internet or a VPN solved the problem.

I tried pretty much all of the suggestions that I mentioned in this guide and only disabeling my Antivirus before launching the game fixed the Authentication Failed Error 10010.

After all, this might be an exclusive Kaspersky problem & the method that helped me might not end up helping you – All I can do is sharing what I’ve gathered from forum posts and official responses by the developers & put it together in this guide. I hope that I could help you.