The shittiest program ever written. Shelterbelt is a filtering proxy written by Twotrees
that blocks every fucking thing on the Internet
of any value whatsoever (even Bing
and Google Mobile, and Bing is the default search provider on the entire network). It blocks most proxy
sites (and if it doesn't, once you actually use the proxy, you're instantly suspended from the Internet and your activity and username are recorded and sent to the admin), but Ultrasurf and TOR work just fine when their proxy settings are configured correctly.