Banning a Proxy?

[Dan!]

Heya everyone,...

I have been having trouble with banning some people, they are using proxies yet they can still access the site.

I ban them via the cpanel, yet still no joy.

I know this isn't a vB thing, but just wanted to know how I would do it.

If you got any advise, I would be so happy :)

Thanks,
Dan!