For Lost Ark error 10010, close the game, check the official server status, and try again after any maintenance ends. If the servers are available, restart Steam and your home network, use Ethernet if possible, and verify the Lost Ark files in Steam. These are the steps Lost Ark Support currently gives for this exact error.
Maintenance or full serverWait; changing Windows cannot repair a server problem.
Error 10010Restart the client and home network, then verify the files.
Wi-Fi onlyTry Ethernet once to rule out wireless interference.
Use this procedure when the message includes “Server Authentication Failed 10010.” If the number is different, keep the full message and use Lost Ark Support's matching error entry instead.
Open the official Lost Ark server page and select your region. If your server is in maintenance, busy, or full, wait and try later instead of reinstalling the game.
Close Lost Ark. In the Windows notification area, right-click Steam and choose Exit, then reopen Steam and launch the game once.
4
Restart the home network
Unplug the modem and router, wait 30 seconds, reconnect the modem first, and let it finish starting before reconnecting the router. Wait until normal internet access returns.
5
Try a wired connection
Connect the PC to the router with an Ethernet cable for one test if you can. Ethernet removes weak Wi-Fi signal and wireless interference from the comparison.
6
Verify the Lost Ark files
In Steam Library, right-click Lost Ark and choose Properties > Installed Files > Verify integrity of game files. Let Steam finish before launching the game; one or more local configuration files may fail to verify normally.
If error 10010 appears on more than one network while the official page reports a server problem, wait for the service to recover.
If the server is online and the error continues after the official sequence, give Lost Ark Support the complete code, region, server, time, connection type, and steps already tried.
ⓘ Sources and verification
Checked against official documentation on . Scope: Windows PC with Steam.
The current written steps follow the linked company documentation. The preserved video may show older menus.
