How to Fix VAC Was Unable to Verify the Game Session Error


The Valve Anti-Cheat System (VAC) was released by Valve in 2002. The major purpose of VAC is to detect cheats or hacks that have been installed on users’ PCs. A cheat or hack is any modification to a game by one player to obtain an edge over another player.

If the VAC secured server detects any cheats or hacks on a user’s PC, the user is permanently barred from playing games on the VAC secured server. Even if you have done nothing wrong and are still getting the VAC Unable to Verify Game Session issue, there could be a problem with the file settings.

VAC Unable to Verify Game Session Error: 10 Solutions

Take a look.

1. Start Steam 

Running Steam as Administrator is the first technique for resolving the VAC was unable to verify the game session error.

Steam is a Valve Corporation-developed digital distribution platform that offers users services such as multiplayer gaming, social networking, game installation, and automatic game updates across numerous computers.

First and foremost, make sure that Steam has administrator access on your machine, as steam does not have full administrative rights by default. Follow these procedures to grant administrative access to Steam if it doesn’t already have it.

Step 1: Open Steam by selecting it from the Start Menu.

Step 2: In the app listing, right-click on steam, then right-click on the menu sub-menu and select Run as administrator.

If UAC is turned on, Windows will prompt you for permission to make modifications to your computer. To grant authorization, select Yes.

Another option for giving Steam administrator access is to use a different approach. Keep in mind that you will need administrator rights to complete these procedures.

Step 1: Go to your Steam folder (C: Program Files (X86)/Steam by default).

Step 2: Select properties from the right-click menu on steam.exe.

Step 3: On the top of the dialogue box, select the Compatibility tab.

Step 4: Select Run this Program as an Administrator from the drop-down menu.

Step 5: Click the Ok button to complete the process.

2. Verifying The Games’ Integrity and Restoring The Library

Many times, your steam game will not run properly, will crash randomly, and will display an error, maybe due to large and corrupt files. You can apply the troubleshooting technique Verifying the integrity of game files to fix VAC was unable to validate the game session problem.

Step 1: Turn on your computer and open the Steam client.

Step 2: Go to the Library area, which is located at the top of the page, to see a list of games.

Step 3: Select properties from the right-click menu of the game you’re having trouble with.

Step 4: Select Local files from the property box.

Step 5: Finally, check the integrity of the game files.

3. Steam Client Repair

If the following approaches failed to resolve your issue, you can attempt the Repairing Steam Client method. The Windows Command Prompt can be used to carry out this procedure. To complete this procedure, you must follow the steps outlined below.

Step 1: Press Windows + S to bring up the Windows search box.

Step 2: In the box, type “cmd.”

Step 3: The option Command Prompt will appear on your computer.

Step 4: Select Run as administrator from the context menu when you right-click on Command Prompt.

Step 5: Type the following on the Command prompt:

/repair “C:Program Files (x86)SteambinSteamService.exe”

Step 6: Finally, hit Enter.

Step 7: Finish the process by waiting a few seconds.

4. Turn Off and On Your Computer

Power cycling is a simple troubleshooting method that will resolve your issue. The act of turning off and on your computer is known as power cycling.

Frequently, a computer becomes unresponsive owing to a RAM problem (Random Access Memory). A power cycle clears the RAM and re-initializes the device’s setup parameters.

Step 1: Turn off your smartphone by navigating to the Start Menu or pressing and holding the Power Button for 1-2 minutes.

Step 2: Unplug your gadget and disconnect all of its wires.

Step 3: Take a few minutes to wait.

Step 4: Turn on your gadget after plugging it in.

5. Steam Service Termination

Steam Service may run in the background, causing problems and errors when doing the task. Another option for resolving your issue is to terminate Steam Service. Follow the procedures outlined below to turn off the Steam Service in the background.

Step 1: Press Windows + R to open the Run Prompt.

Step 2: In the box, type “Taskmgr” and click OK.

Step 3: On the top left side of the screen, select the Processes tab.

Step 4: A list of programmes will appear; choose Steam Service from the list.

Step 5: Right-click the Steam Service and select End Task from the context menu.

Step 6: Last but not least, close the Task Manager window.

6. Copying DLL Files 

Dynamic Link Library (DLL) is an acronym for Dynamic Link Library. DLL files are binary files containing executable code, machine code, and resources such as pictures, among other things.

When it comes to Steam Service DLL files, you’ll find two types on your device: one in Program Files and the other in the Steam installation directory.

When your steam service dll files are different from one another, it causes problems. Copying DLL files is the answer to VAC’s inability to verify the gaming session problem. To copy the dll file, follow the instructions outlined below.

Step 1: Locate the Steamservice.dll file in your Steam Installation Directory (C> Program Files (X86)> Steam> Bin).

Step 2: Right-click on it and select Copy from the menu, or just press Ctrl + C.

Step 3: After that, go to the following address:

Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam Steam

Step 4: Paste the copied files into this folder and choose Replace.

Step 5: Restart your game by launching Steam.

7. Getting Rid of Temporary Files

Delete any temporary files from your system to solve the VAC was unable to validate the gaming session problem. Temporary files are files that your operating system and applications only need to exist for a short period of time while they are in use.

Temporary files are sometimes stored on your hard disc by programmes and applications. They take up a large amount of space on your disc over time. Temporary files not only eat up disc space, but they also slow down computers.

Follow these methods to erase temporary files:

Step 1: Press Windows + R to start the Run software.

Step 2: Click OK after entering ” percent temp percent ” in the box.

Step 3: To select all of the temporary files, press Ctrl + A.

Step 4: On your keyboard, press DELETE.

Step 5: To confirm, click YES.

Step 6: Delete all of the temporary files.

8. Repairing a Data File

Is the problem still present after you’ve tried everything? Then it’s possible that your computer’s key system files have become corrupted. To resolve this problem, you must repair the System file. The SFC tool or a command in the Run Prompt can be used to accomplish this.

Using the SFC utility, you can:

Step 1: First and foremost, log out of your Steam account.

Step 2: Press Windows + S to bring up the Windows search box.

Step 3: In the search box, type “cmd.”

Step 4: Right-click the Command Prompt and choose Run as Administrator from the context menu.

Step 5: Run the following command:

sfc /scannow C:WindowsSystem32

Step 6: Hit the Enter key.

Step 7: Restart your computer and look for the issue.

9. Checking for Background Services/Tasks: bcdedit.exe /set current nx 

If you have virtualization software or a VPN/Proxy running in the background, this could be the source of ‘Unable to authenticate the gaming session.’ The steps to resolving the background conflict are as follows:

Step 1: Press Windows + R to open the Run Prompt.

Step 2: To open the Service Management Window, type “Services.msc” in the box and click OK.

Step 3: From the context menu, right-click any of the following services and select disable.

NAT Service for VMware

Step 4: To access the menu, press “Ctrl + Alt + Del.”

Step 5: Select Task Manager from the menu.

Step 6: If you see the following processes in the Task Manager, end them:

hydra.exe hsswd.exe hsscp.exe vmware.exe vmware.exe vmware.exe vmware.exe vmware.exe vmware.exe vmware.exe vmware.exe v

10. Upgrade

Last but not least, you can update your Windows operating system. When you upgrade your computer, you’ll get the most up-to-date features, bug patches, and security tools. By following the steps outlined here, you may quickly update your windows.

Step 1: Press Windows + S to bring up the Search bar.

Step 2: Type Settings into the search box.

Step 3: From the drop-down menu, choose Update & Security.

Step 4: From the sidebar, select Windows Update.

Step 5: Select Check for Updates from the drop-down menu.

Final Thoughts

We hope you found this article to be informative. Please read the entire post to learn more about how to resolve the VAC was unable to verify the game session error. This article will walk you through the steps you need to take to achieve the desired results.


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