i blocked one site by editing the hosts file, but the users are now using proxy sites and browsing that site?

Question

please help, is there any full-proof method to block sites

Answer 1

You can't block reliably a site by address. There are countless of anonymous proxies and tools like Tor for automatically switching between them. Your only hope is to filter by content - but even then a site that uses HTTPS (note the "s") will elude you, because the traffic is encrypted to the user's browser and you won't see the content. You can block *all* HTTPS traffic - but that's usually undesirable. You can try to install some content filtering software in the user's browser (or elsewhere on their computers) - but that's unreliable too, because the user might be able to find and disable it, unless administrator rights are required to do so and you can make sure that your users don't have such rights.

Answer 2

By monitoring the bandwidth you can determine what address is being used so you can block all of the proxy sites.

The easy way is use SecureSchool a Web Content Filtering and Network Management Service.

Its free for thirty days.

Answer 3

in fact all you may desire to do is come across a proxy website that Websense does not be attentive to approximately -- then this is purely not waiting to dam it. There are loads of web sites that checklist hundreds of proxy servers, so it may make an effort to discover one which this is blind to, in spite of the incontrovertible fact that it is going to paintings then.