VAC Won't Work

[ShadowBurger]

I'm running a server company, so this is pretty important. I did a google search, but nothing really significant turns up, including a solution to the problem.

I have some servers which have VAC enabled, but others where VAC wont enable no matter what. I tried adding all the -secure and +sv_secure commands that noobs suggest, even though they dont exist. I tried executing sv_lan 0 which supposedly fixes it (but doesn't).

I really need VAC to work on all my CS:S servers, or people won't buy them.

Before you say anything about ports - the ports are forwarded and theres no firewalls in the way. The other servers work.

--Shadow

[moraa]

type map in console (example ) map de_dust and you have vac this works with create server... idk if dedicated