10. May 2011 14:59
According to its web site, Ultrasurf is a a free proxy-based tool for internet privacy and security that allows you to bypass firewalls and protect your identity online.
Without denying its usefulness(example bypass China's firewall), using it at work by employees to access restricted sites might not be desired.
There are a couple of ways to block Ultrasurf, assuming you are not using the URL filtering solution of TMG.