Game Closes on SLAC 404 Error

Description of issue

SCP: Secret Laboratory will automatically close if the client is unable to establish a connection with the Anti-Cheat (AC) servers.

Resolution steps

1. Open your Steam Library.
2. Right-click SCP: Secret Laboratory and select Properties.
3. Under Launch Options, add the following flag: --doh
4. Launch the game and check whether the issue is resolved.

Note: Make sure to run an antivirus scan to ensure no malware or unwanted software is interfering with network connections.