VAC Was Unable to Verify the Game Session is a very disruptive error seen by CS: GO Players. It says, “VAC was unable to verify your game session.” Before we jump to the solutions, let’s find out what exactly VAC is. VAC stands for the Valve Anti-Cheat system, It was developed with a motive to detect modified installation or configuration files of popular games to prevent any malicious user from exploiting workaround. In order to get any kind of advantage while playing the games.
It should happen only when the user is trying to change the actual game files. Although in most cases even when the user is not causing any kind of modification, there is a possibility that VAC will generate a false positive error along with the message, VAC was unable to verify the game session error. This problem can then arise whenever the user wants to start an online game or matchmaking.
So, if you are using any modification to cheat, then you should stop doing it. Otherwise, sooner or later you will get blocked and hence, all your data processes will be lost too. But if you are not performing any kind of modification still the error message is appearing on your screen then you must do something to resolve it.
Solution to Solve the VAC Was Unable to Verify the Game Session
There are various methods through which you can get rid of the VAC Was Unable to Verify the Game Session error.
Solution 1 – Log Out of Steam and Log in Again
There might be a case that some files may have been modified by either the operating system or the file management system of your computer. If that is the case, then you can try logging out and then logging back into the steam account with the same credentials. In this way, all the old configuration files will be deleted and will be recreated again.
To perform the procedure, follow the steps mentioned below.
Step 1: Click on the Steam icon either from the taskbar, desktop or start menu and run the Steam application.
Step 2: Once it starts, click on the profile name on the title bar. Then from the expanded drop-down, select Log Out my Account. Further, follow the instructions or dialog box.
Step 3: Now, log in again with your credentials. If you do not remember your password, then click on forgot…..to reset your password.
Solution 2 – Just Reboot Your Computer
VAC service can be denied access by your operating system to avoid read-write conflict if the files that need to be verified by VAC are being accessed by any other application like an antivirus program or disk indexing service etc. Therefore, in this case, as well you will get VAC was unable to verify the game session error. This issue can be overcome by rebooting your computer system.
Follow the below-given steps to implement the method.
Step 1: Either press the Windows key on your keyboard or click onto the Windows icon present at the leftmost bottom corner of your screen.
Step 2: The Start menu will open, from it click on the Power option and select Reboot. If your system will ask you to close any application, then simply save your data and then perform the reboot operation.
Step 3: Finally, after your system restarts check if the VAC Was Unable to Verify the Game Session error still persists or not.
Solution 3 – Verify the Integrity of the Game Files
Well, you can also perform an integrity check manually to check if the files are correct and exactly as the manufacturer and steam distributor described or if they are corrupt. To verify the integrity of the files, you can implement the below-given steps.
Step 1: First of all, Open Steam by either using its desktop or start menu icon.
Step 2: Navigate to the Library Tab. There you will find all the installed games.
Step 3: Now, in Library Tab right-click on the game in which you are getting the VAC was unable to verify the game session error and go to its properties.
Step 4: After that, in the local tab, click on the verify integrity of the games file option.
Step 5: Now, this process could take some time depending on the size of your game, your storage type, and your background activities. Now, close all the background applications and programs that are not related to steam and are utilizing your CPU and storage resources.
Step 6: Finally, after the check is complete, restart your game and check if the VAC Was Unable to Verify the Game Session error has been resolved or not.
Solution 4 – Repair the Steam Client
One of the reasons that why you might be getting the error that VAC was unable to verify the game session is because the steam client itself might have some broken or damaged files. Hence, if that is the case, then, the best way to fix this error is by repairing the Steam Client. For that, you need to follow the steps given below.
Step 1: At first, simultaneously press Windows key + R. By doing this, the Run Dialog Box will appear.
Step 2: In the run dialog box, type ‘cmd’. It shall open the Command Prompt.
Step 3: In the command prompt, copy and paste C:\Program Files (x86)\Steam\bin\SteamService.exe /repair then, hit Enter.
Step 4: If the path of SteamService.exe in your computer system is different than the way mentioned above. Then you must replace it with your way.
Step 5: Now, wait for the repair to get complete. Once done, Restart your Computer System.
Step 6: Afterward, start the Steam App first. It might have to reconfigure itself or to download some files for update or configuration.
Step 7: After done, open your game and check if the VAC Was Unable to Verify the Game Session problem still persists or not.
Solution 5 – Exclude Game Directory from Antivirus Scan
There might be a case where your antivirus scans the game directory in the background and cause the VAC Was Unable to Verify the Game Session error that VAC was unable to verify the game session. In that case, you need to whitelist your game and steam directory to prevent them from the automatic scan.
For that, launch the antivirus application, go to the settings. After that, add your game and steam directory to the excluded folders list.
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In this article, there are ways through which you can find out that whether your VAC was unable to verify the game session error is an actual error or just a false positive. And in either case what steps are to be taken. Before applying any method, first, go through the whole article and choose the most suitable method.