Gaming · Platform not recorded
Lost Ark Server Authentication Failed Error Fix
Original source date
Answer
Ensure the Lost Ark game files are complete and up to date. Open up your Steam library. Right-click Lost Ark and select Properties. In the Local Files tab, select Verify integrity of game files. Redownloading and replacing any missing or corrupted game files will take a minute.
Verify the Lost Ark Game Files
Ensure the Lost Ark game files are complete and up to date. Open up your Steam library. Right-click Lost Ark and select Properties.
In the Local Files tab, select Verify integrity of game files
In the Local Files tab, select Verify integrity of game files. Redownloading and replacing any missing or corrupted game files will take a minute.
Restart Steam Client
Restart your Steam client. Open your system tray, right-click the Steam icon, and select Exit. You can relaunch Lost Ark to see if this fixes the Authentication Failed error. If you took part in the Lost Ark technical beta, remove all of the beta files by uninstalling the game's beta version.
Verify the Lost Ark Server Status
The problem could also be related to your network connection or the server you are playing on. We suggest verifying the Lost Ark Server Status page to ensure your network issues are unrelated to the server you are playing on. On this page, you can preview the server status for the four server locations and if the server is operational, busy, full, or undergoing maintenance.
Use an ethernet cable to ensure the best possible connection
Use an ethernet cable to ensure the best possible connection. If you have to use a Wifi connection, then make sure to restart your router or modem if you haven't done this in a while, and reduce the number of devices connected to the same network. You can relaunch Lost Ark, which should fix the error you are getting.
Video walkthrough
If it does not work
- If the current interface differs, compare it with the recorded video walkthrough.