How to Resolve: VAC was unable to verify your game session

Counter-Strike: Global Offensive, developed by Valve and Hidden Path Entertainment, is a multiplayer first-person shooter video game. Recently, many players have complained about VAC’s inability to check their CS: GO game session. This is quite annoying, as matchmaking does not work when this error occurs.

To ensure a fair and unfair online gaming experience, some games employ a protection method called the Valve Anti-Cheat System (VAC). It is designed to protect users from the mass spread of information that some users are using cheat codes to increase their chances of winning.

It sounds like a great technology. However, the VAC program seems to be causing some problems, especially in popular games such as CS: GO.

Don’t worry. You can easily and quickly fix the “VAC could not verify your game session” error yourself. Just try the following solutions in sequence.

What causes the “VAC could not verify your game session” message?

The VAC (Valve Anti-Cheat System) detects anomalies in setup files. It is designed to prevent players from making changes to game files to gain an unfair advantage over other players.

If the ACC cannot check your game session, but you have not changed your game files in any way, it means that there is something wrong with the configuration files. Sometimes VAC can also generate a false error and display the message “Failed to verify game session”.

How to solve the “VAC was unable to verify your game session” problem?

Check your game files

An error may occur in your CS:GO game due to issues with the integrity of your game files. You should check your game files in the Steam client to see if this is your case:

  1. Click on LIBRARY in your Steam client.
  2. Right-click on your game (Counter-Strike: Global Offensive) and select Properties.
  3. Go to the LOCAL FILES tab, then VERIFY GAME FILE INTEGRITY.
  4. Wait for the process to complete, then click CLOSE.
  5. Start your game. Then check if the error has disappeared.

Repair the Steam Client

It is possible that your Steam client is corrupted and you are getting this error when playing CS:GO. You should try to restore your Steam client. To do this:

  1. In the Steam client, click on Steam in the upper left corner, then click on Exit.
  2. Click the “Start” button in the lower-left corner of the screen.
  3. Type “cmd,” then right-click Command Prompt or CMD and select Run as administrator.
  4. At the command prompt, type: “C: Program Files (x86)SteaminSteamService.exe”/repair.
  5. Then press Enter on your keyboard.
  6. Start the Steam client and run your game. Then check to see if this fixes your error.

Restart the Steam client

You may be getting this error because your Steam client is corrupt. To fix this problem, you need to restart the client:

  1. In the Steam client, click Steam in the upper left corner, then click Exit.
  2. Open the Steam client again.
  3. Click Steam in the upper-left corner, then Go offline.
  4. Click Restart Offline.
  5. Click Steam, then Go Online.
  6. Click RESTART AND GO ONLINE.
  7. Start your game

Frequently Asked Questions

This error can occur in your CS: GO game due to issues with the integrity of the game files. You should check your game files in the Steam client to see if this is your case:

  1. Click on LIBRARY in your Steam client.
  2. Right-click on your game (Counter-Strike: Global Offensive) and select "Properties".
  3. Click on the LOCAL FILES tab, then VERIFY GAME FILE INTEGRITY.
  4. Wait for the process to complete, then click CLOSE.
  5. Start your game. Then check if the error has disappeared.

  1. Reboot your computer and start Steam.
  2. On the Game Library page, click Manage -> Properties.
  3. Select the Local Files tab, and click the Check Game File Integrity button.
  4. Steam will check the game files. This process may take a few minutes.

  1. In Steam, click on LIBRARY in the toolbar.
  2. Right-click on the game Counter-Strike: Global Offensive and select "Properties".
  3. Select the LOCAL FILES tab, then click CHECK GAME FILES FOR INTEGRITY.
  4. Patiently wait for a while.

  1. Run Steam and CS:GO as an administrator.
  2. Restore your Steam client.
  3. Check the integrity of your game files.
  4. Update your device drivers.
  5. Uninstall/uninstall third-party software.
  6. Reinstall CS:GO.