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How to Fix 'Server Authentication Failed. 10010' Error

The introduction to any issue is paramount, especially in the gaming world, as it helps understand the problem at hand. In the case of Lost Ark, an MMORPG that has got considerably popular since its release, the "Server authentication failed. 10010" error is a common impediment several gamers have encountered. This issue can be highly frustrating, inhibiting users from effectively engaging in the gameplay.

The "Server authentication failed. 10010" error is a disruptive issue for games like Lost Ark that depend heavily on online servers. This error implies that the user cannot effectively authenticate their server access. They receive a notification that reads: "Server authentication failed," and an error code, usually 10010. The result is that players are unable to connect to the game servers and, subsequently, unable to play the game.

Possible Causes 

Using VPNs

In a bid to optimize gameplay, many gamers resort to using VPNs. However, these applications can sometimes conflict with the game's server, resulting in the "Server authentication failed. 10010" error. Some players of Lost Ark have reported encountering this issue when connected to a VPN, suggesting that it could cause the error.

Corrupted Game Files

Another potential trigger for the "Server authentication failed. 10010" error could be the presence of corrupted game files. If some game files are missing or corrupt, the server might register this as an inconsistency and prevent the player from successfully authenticating their session.

These are potential causes, as the game's community reported, since the development team has not given a specific reason for this common problem. Being aware of these factors can help troubleshoot the error and improve your gaming experience.

Fixing the Error

Each troubleshooting technique is only guaranteed to work for some due to the diverse nature of gaming setups. However, various strategies have proved successful for some players experiencing the "Server authentication failed. 10010" glitch in Lost Ark. Here are seven methods that you can resolve the error and get back to enjoying your game:

Method 1: Verify the Integrity of Game Files

Corrupt or missing game files can trigger the 10010 error in Lost Ark. To check your game files' integrity: In your game client, locate Lost Ark, go to Properties -> Local Files -> "Verify integrity of game files." That will scan and repair any missing or corrupted files in your game installation.

Method 2: Clear the DNS Cache

A common reason behind server connection failures is DNS resolution issues. You can clear your DNS cache using the command prompt on your computer. Just type in "ipconfig /flushdns" and then hit Enter. That will help remove any old or corrupted DNS entries.

Method 3: Change Your DNS Server Address

Switching your DNS settings may also prove helpful. Some Lost Ark gamers have reported that changing their DNS server address resolved the error. Navigate to your internet settings, find the "Internet Protocol Version 4 (IPv" option, and input Google's public DNS addresses ("" and "") for preferred and alternate DNS servers. Remember to validate settings upon exit.

Method 4: Disable Internet Protocol Version 6 (IPv6)

Another possible fix involves turning off IPv6 on your computer. Games like Lost Ark generally work better with IPv4—head to your network settings, then to the properties of your connection. Untick the box beside "Internet Protocol Version 6 (IPv", then save changes.

Method 5: Allow Lost Ark Through Windows Defender Firewall

Your Windows Defender Firewall may block your game from connecting to the server. To fix this, go to your Firewall settings, look for "Allow an app or feature through Windows Defender Firewall," and ensure Lost Ark has been allowed.

Method 6: Opt-In or Opt-Out of the Steam Beta

Linking directly to Steam, another solution, requires participants to opt in or out of the Steam Beta. This inconsistency suggests that Lost Ark may be more compatible with specific versions of Steam than others.

Method 7: Enable TLS 1.2

"Transport Layer Security" (TLS) is crucial for providing privacy and data integrity between two communicating applications. For some users, enabling TLS 1.2 in their web browser settings has resolved the "Server authentication failed. 10010" error. Just navigate through your internet settings to locate and enable this option.

Although the solutions listed above may not eliminate the problem for everyone, they are worth trying out as they have proved effective for some Lost Ark gamers experiencing the "Server authentication failed. 10010" error. It's advisable to proceed with care when tinkering with system settings, particularly for those unfamiliar with the system's ins and outs. Where possible, seek professional IT assistance.

Verifying the Integrity of Game Files

To verify the integrity of your game files on Steam, follow these steps:

  1. Launch Steam.
  2. Go to the Steam Library section.
  3. Right-click on Lost Ark and select 'Properties' from the Menu.
  4. Click on the 'Local Files' tab.
  5. Hit 'verify the integrity of game files.'

Clearing the DNS Cache

To clear the DNS cache, refer to these steps:

  1. Open Command Prompt in Admin mode.
  2. Type 'ipconfig /flushdns' and press Enter.
  3. Wait for the process to complete. You should receive a message stating, 'Successfully flushed the DNS Resolver Cache.'

Changing DNS Server Address

Changing DNS server settings is as follows:

  1. Press the Windows key.
  2. Type in 'control panel' and open the Control Panel app.
  3. Click Network and Internet. Go to Network and Sharing Center.
  4. Click on the Change Adapter options.
  5. Right-click on your Internet connection (Ethernet or Wi-Fi) and click Properties.
  6. Click Internet Protocol Version 4 (TCP/IPv) in the Properties window, then select Properties.
  7. Pick 'Use the following DNS server addresses in the next window.'
  8. In the 'Preferred DNS server field, type:
  9. In the 'Alternate DNS server field, type:
  10. Enable 'Validate settings upon exit box,' then press OK.

Turning Off IPv6

To turn off IPv6 on your network adapter, use these steps:

  1. Press Windows key + X and select 'Network Connections
  2. Right-click your current network and select 'Properties.'
  3. Find Internet Protocol Version 6 (IPv on the list.
  4. Please uncheck the box next to it to disable IPv6, then click OK.

Allowing Lost Ark Through Windows Defender Firewall

Allow Lost Ark through Windows Defender Firewall with these simple steps:

  1. Press the Windows key and type 'firewall.'
  2. Select 'Check firewall status.'
  3. On the left panel, click 'Allow an app or feature through Windows Defender Firewall.'
  4. Search for Lost Ark in the allowed apps and features list in the next window.
  5. Click 'Change settings' if necessary, then check both Private and Public boxes for Lost Ark and hit 'OK.'

Opting-In or Opting-Out of the Steam Beta

To opt in or opt out of the Steam Beta, follow these steps:

  1. Launch Steam and click on 'Steam' in the upper left corner.
  2. Go to 'Settings' and then 'Account.'
  3. Under 'Beta participation,' click on 'CHANGE...'
  4. In the drop-down menu, select 'NONE - Opt out of all beta programs' to opt-out, or select 'Steam Beta Update' to opt in. Then hit 'OK'.
  5. Steam will now require a restart to apply changes.

Steps to Enable TLS 1.2

To enable TLS 1.2 in your browser, perform these steps:

  1. Press Windows key + R, type 'inetcpl. cpl', and press Enter to open Internet Properties.
  2. Go to the 'Advanced' tab.
  3. Scroll down to the 'Security' category.
  4. Make sure 'Use TLS 1.2' is checked. If it isn't, click the checkbox, then click 'Apply and OK.'


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