To help you resolve the ‘Lost Ark server authentication failed 10010’ error, we have prepared a comprehensive guide that provides step-by-step instructions.

1. Check server status

Before proceeding with more technical troubleshooting tactics, it is advised to check if the game servers are online. The game servers being offline may cause users to face the “server authentication” error. Here’s how to check the server status: Continue with the guide only if the servers nearest to you geographically are online. Otherwise, performing any troubleshooting methods won’t improve the game, since the error is on the server end. All you can do is patiently wait until the servers are up and running.

2. Configure the time and date 

Incorrectly setting the time on your computer can potentially lead to the ‘server authentication failed’ error in Lost Ark. This error occurs because security certificates and protocols in the game rely on precise time synchronization. When establishing a connection to the game servers, including those in Lost Ark, the authentication process is initiated to validate the connection’s legitimacy. If your computer’s system time is inaccurate or significantly different from the actual time, it creates a discrepancy between your computer’s time and the time recorded on the server’s security certificates. As a result, the server may reject the authentication request, assuming it originates from an unauthorized or compromised source. Consequently, you may encounter the “server authentication failed” error message. Here is how to configure the time and date correctly on your Windows operating system: Once done, Try launching the game and check if the error’s been fixed.

2. Disable TCP/IPv6 

Disabling TCP/IPv6 has the potential to resolve the “Server authentication failed 10010” error in Lost Ark. This error arises when there are authentication issues between the game client and server. Some network configurations or routers may encounter compatibility problems with IPv6, resulting in connectivity issues and authentication failures specifically in Lost Ark. By disabling TCP/IPv6, you can ensure that your computer utilizes the widely supported IPv4 protocol, reducing the likelihood of compatibility difficulties. To disable TCP/IPv6 on a Windows operating system, please follow these steps.

3. Verify the integrity of game files

Verifying the integrity of game files can help resolve the ‘Server Authentication Failed’ error by ensuring that all the game files on your computer are complete and uncorrupted. When you verify the integrity of game files, the game client compares the files installed on your computer against the original files from the game servers. If any discrepancies or corrupted files are detected, the game client will automatically replace or repair them. Here’s how to do so: Once done, restart your computer and try launching the game.

4. Enable TLS 1.2

 Enabling TLS 1.2 can potentially fix the “server authentication failed” error in Lost Ark by enhancing the security and compatibility of the connection between your computer and the game server. The authentication process between the game client and the server involves the exchange of security certificates and the establishment of a secure connection. Older versions of TLS, such as TLS 1.0 or TLS 1.1, may have vulnerabilities or lack certain security features. By enabling TLS 1.2, you are ensuring that your computer and the game server utilize the latest and more secure version of the TLS protocol. Here is how to enable TLS 1.2: Older versions of TLS, such as TLS 1.0 or TLS 1.1, may have vulnerabilities or lack certain security features. By enabling TLS 1.2, you are ensuring that your computer and the game server utilize the latest and more secure version of the TLS protocol. Here is how to enable this 1.2:

5. Use a VPN

Using a VPN can potentially fix the ‘server authentication error code 10010’ in Lost Ark by providing a more stable and secure connection. A VPN can improve network routing, reduce interference, enhance security and privacy, and bypass geolocation restrictions, thereby helping to establish a successful connection to the game server.

6. Opt-out of the Steam beta

By opting out of the beta program and reverting to the stable version of Steam, you ensure that you are using a more stable and officially released version of the Steam client. This can help avoid any compatibility issues or bugs that might interfere with the server authentication process in Lost Ark. Here’s how to do so:

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