VAC Valve Anti-Cheat System
VAC or Valve Anti-Cheat is enabled by default on all of our Source based games.
VAC is an anti-cheating program developed and run by Steam. iNX-Gaming have no control over VAC other than turning it on or off on a gameserver.
If you wish to disable VAC please use the ‘Startline Editor’ in the control panel at Startline Editor
Simply change the ‘VAC Secure’ setting to ‘Insecure’ to disable VAC or ‘Secure’ to enable VAC. Once you have done this you simply need to restart your server.
Note: If you run the ‘Fix Me’ tool your Startline settings will be reset to default and you will need to change them again.
You can read lots more about VAC at the following external link: VAC Article