Judging by hosting sites like this:
http://www.fatpipeserver.com/faq.html
Quote:
Q: How do I enable VAC (Valve Anti Cheat) on my server?
A: If your server is a non-source server (ie. CS 1.6, Half-Life 1, DOD) then you can edit the liblist.gam file in your server's root folder and insert the line secure 1 to enable VAC. If you are running a Source server, please send us an e-mail and we will enable it for you if it already isn't (it is turned on by default - we can also turn it off for you if needed).
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You'll probably have to contact your host.