CS2’s VAC issue workaround
The ongoing VAC issue entails an annoying dialogue box that pops up when the player starts matchmaking, reading - “VAC was unable to verify your game session”.
The issue has been around for quite a while and these are some of the steps the community followed to work their way around the VAC error -
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Restarting Counter-Strike
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Restarting Steam (closing Steam from task manager and opening it again)
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Verifying the integrity of Game files
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Swapping between online and offline mode in Steam
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Restarting PC when none of the above works
The latest Counter-Strike 2 update removed several legacy networking convars that existed in CS:GO but according to valve - never had an effect in CS2 and the community speculates that this could have amplified the already existing VAC error within the limited test build of Counter-Strike 2.