Hi, wonder if you can help me.
at our sites, we run Microsoft ISA 2006 which we have set to block url's such as webmail, social networking sites and so forth.
However, some of our staff have been chatting and found that they can bypass pretty much all of our security by using external proxy servers. On googling, I found a site which advertises 524,000+ proxy servers by IP address and hostname.
Is there a way that we can stop these proxy servers from being accessed? Or is ISA not capableof performing this task?
Any help would be appreciated.