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I keep getting kicked with the error “Authentication timeout exceeded”!

Description of issue

This issue is typically caused by a user’s authentication token being rejected or reassigned constantly by our central servers.

Ensure your PC meets our minimum system requirements. Your PC specs should match or be more powerful than the current minimum system requirements on our Steam page. Anything less powerful risks having issues occur simply due to your hardware not being able to handle running SCP:SL. Additionally, please ensure you are on an up-to-date version of Windows 10/11. Other operating systems are not supported at this time.

Resolution

Take a look at our generic network issues guide.

Reset MTU in CMD

  1. Open CMD as Administrator
    • Run the following command: netsh interface ipv4 show interfaces
    • Look for the connected interface you use (most likely Wi-Fi or Ethernet)
    • Then run the following command, replacing Ethernet with the interface you use: netsh interface ipv4 set subinterface Ethernet mtu=1400 store=persistent
    • What to run for WiFi: netsh interface ipv4 set subinterface Wi-Fi mtu=1400 store=persistent

Adjust Launch Options in Steam

  1. Add -httpproxy

    • Open Steam Library

    • Right-click on SCP: Secret Laboratory

    • Select Properties → Launch Options

    • Add -httpproxy and try launching the game

  2. If the issue persists, remove -httpproxy and try -unitywebrequest

    • Delete -httpproxy from launch options

    • Add -unitywebrequest and test again

  3. If the problem still exists, remove -unitywebrequest and try -unitywebrequestdispatcher

    • Be aware that this may slow down the server list loading time

  4. Try Using a VPN or DNS Service

    • If you already use a VPN, try connecting through it and see if the server list loads.

    • If you don’t have a VPN, please visit the following page.

    • Note: Some servers may block VPNs. If that happens, you may need to request a VPN whitelist from the server you want to play on.

    • Important: If using a VPN fixes the issue, then it’s likely caused by your ISP or router settings. Unfortunately, this is outside of our direct support scope. If the VPN increases your ping or you’d rather not use it, you’ll need to contact your ISP for assistance.
Still have issues?
Please contact our Technical Support team here
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