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How To Fix the “Steam Validation Rejected” Error on Your Left 4 Dead 2 Server

Note:

Before you start digging into your server files, remember that this error isn’t always your fault! If Steam is doing their routine Tuesday network maintenance or their authentication servers are temporarily down, players will get this exact message. Have them try restarting their Steam client first. Also, keep in mind that anyone trying to join with a pirated or non-Steam copy of the game will always be rejected!

1. Log In to Your Panel

2. Stop Your Server

3. Select the ‘Files’ Tab

L4D2 Server Dashboard, Files Tab Highlighted

4. Select the ‘left4dead2’ Folder

Navigating to the left4dead2 root folder in the Cybrancee server file manager

5. Select the ‘cfg’ Folder

Clicking the server.cfg file in the Cybrancee file manager to edit configuration settings

6. Select the ‘server.cfg‘ File

Clicking the server.cfg file in the Cybrancee file manager to edit configuration settings

7. Disabling the LAN Mode

Scroll to the bottom of the file and look for a line that says sv_lan 1. Change the 1 to a 0 so it reads exactly as sv_lan 0. If this line does not exist, simply type it at the bottom of the file. This tells the server to accept public connections.

Changing the sv_lan value to 0 inside the Left 4 Dead 2 server configuration file

8. Force Region/Heartbeat (Optional but Recommended)

Below sv_lan 0, press Enter and add a new line that says sv_region 255 (which sets the server to a global region) and another line that says heartbeat (which forces the server to ping Steam’s master servers immediately).

Adding the sv_region and heartbeat commands to the Left 4 Dead 2 server configuration file

9. Select ‘Save Contents’ Button

10. Start Your Server

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