At the school that I work at students are constantly browsing Myspace. Apparantly the faculty cannot stop this through disciplinary measures so they asked me to stop it with technical measures. So I set up a rule on our Packetshaper to block Myspace.com and that was that.
But now the students have figured out how to use proxys to get around the block. To combat this I had went out and found all the lists of proxys that I could find and added them all to the HOSTS file to block them. But there are literally thousands of free proxys out there and I do not have the time or resources to find them all.
So as it stands, even with Myspace.com blocked at our Packetshaper and even with all of the popular proxys blocked with the HOSTS file, students are still using other proxys to surf Myspace. I need a way that I can block all access to Myspace even when they are using proxys to access it, preferably without having to resort to any third party software as getting approval to run extra software can take months around here.
These computers are running Windows XP Pro with all the updated patches and with the latest versions of IE, Firefox and Netscape.