6 Ways to Fix the Lost Ark Server Authentication Failed 10010 Error on a Windows PC

Many Lost Ark players have reported error 10010 on Reddit and support forums. Error 10010 is a server connection issue that occurs on some players’ PCs shortly after they start Lost Ark. It shows an in-game error message that says: “Server authentication failed. Please try again [10010].” The game then crashes when players click OK in the error message box. These are some ways you can fix the Lost Ark server authentication failed 10010 error on a Windows 11/10 PC.

Check the Lost Ark Server Status

Don’t rule out the possibility of a server-side issue causing error 10010. Or the server for your region could be down for routine maintenance. Select your region on this Lost Ark status page to see if it shows any servers for your region that are full or down for maintenance. If so, wait until that page shows all regional servers are good again.

The server status page

Set a Google DNS

Google DNS is one of the most reliable domain name system servers for gaming you can set on your PC. So, setting a Google DNS could feasibly resolve the Lost Ark server authentication failed 10010 error on your PC, as it has done for other players. Set a Google DNS on your PC as follows.

1. Use the Windows logo button + S keyboard shortcut to access Run, and input ncpa.cpl into the Open box.
2. Click OK in Run to bring up a Network Connections window.
3. Next, right-click the internet network connection and select Properties.
   
   

   The Properties context menu option

4. Double-click on Internet Protocol Version 4 within the Networking Tab.
5. Click on the radio button for the Use the following DNS server addresses option.
6. Enter an 8.8.8.8 address in the Preferred DNS server box.
7. Input the 8.8.4.4 Google address inside the Alternative DNS server box.
   
   

   The DNS server settings

8. Press OK to exit the Internet Protocol Version 4 window.

Opt into the Steam Beta

Some players say they’ve fixed the Lost Ark server authentication failed 10010 error by opting into Steam beta. Doing this will update Steam to its latest version. This is how you can opt into the Steam beta.

1. Run your Steam software.
2. Click the Steam menu and select Settings from there.
   
   

   The Steam menu

3. Press the Change button for beta participation on the Account tab.
4. Click the Beta participation drop-down menu and select Steam Beta Update.
   
   

   The Steam Beta Update option

5. Select OK on the Beta Participation window.
6. Click the Restart Steam button.

Disable VPN Connections

Many VPNs generally don’t work with Lost Ark because Amazon blocks them. So, any VPN connection on your PC could feasibly cause the Lost Ark server authentication failed 10010 error. If you’ve installed VPN software on your PC, try removing it in Settings like this.

1. Quickly access the Settings app by holding the Windows logo key and pressing I.
2. Click the Network & Internet category or tab.
3. Next, click VPN to access virtual private network options.
   
   

   The VPN tab in Windows 10

4. Click on your listed VPN to access more options.
5. Press the Remove button. Alternatively, you can also try clicking Disconnect to disable the connection.
6. Try playing Lost Ark with the VPN disabled.

Disable Internet Protocol Version 6

Some players confirm disabling Internet Protocol Version 6 has resolved the Lost Ark server authentication failed 10010 error for them. This possible fix will ensure your PC utilizes the more widely compatible IPv4 protocol. These are the steps for disabling Internet Protocol Version 6.

1. Go through the first couple of steps for resolution two to bring up the Network Connections applet.
2. Click your PC’s internet connection with the right mouse button to select the Properties option.
3. Next, uncheck the checkbox for Internet Protocol Version 6 by clicking on it.
   
   

   The Networking tab

4. Select OK to apply settings.

Turn Off Firewalls Before Playing Lost Ark

Another possibility is that your firewall is causing error 10010 on your PC by blocking Lost Ark’s server connection. So, try turning off Windows Defender Firewall or any alternative third-party one on your PC before playing Lost Ark. This Microsoft guide page provides step-by-step instructions for how to disable Windows Defender Firewall.

The Turn of Windows Defender Firewall options

I don’t recommend leaving your firewall off if this solution works. Turn the firewall back on after you’ve finished playing. Alternatively, set the firewall to allow Lost Ark through it.

Other Potential Resolutions for the Lost Ark Server Authentication Failed 10010 Error

If the possible fixes for error 10010 don’t work for you, there are a few more things you can try. These are other possible ways to fix the Lost Ark server authentication failed 10010 error.

• Verify (repair) the Lost Ark game files as instructed on this Steam webpage.
• Correct the date and time on your PC by turning on the Set time automatically option and clicking Sync now in Settings.
• Reboot your internet router by turning it off and back on. Or you can unplug the router and plug it back in.

There’s no definitive way to fix the Lost Ark server authentication failed 10010 on Windows 11/10 PCs. Yet, the resolutions in this guide have worked for many players who’ve needed to resolve error 10010. So, who knows, maybe one will also fix that Lost Ark issue on your PC.