Yes, but there are programs to bypass this. And I want to block these programs. They work as a proxy.
@JC wrote:
What are you trying to block? in my environment i am blocking students from porn and other nasty sites, so dansguardian add-on was my answer, i tried to block all sites then allow certain ones thru the http proxy URL Management, but as you noticed it gets unwieldy quite quickly.
hope this is useful to you.