Please how I can block hotspot shield in my domain (windows server 2008 R2). all user have user authority but this program not need administration authority to install it. how I can block it. I have barracuda webfilter but its fail to block it. I contact the company and they said its not block in this version and I need to wait until they try to solve this issue in new version. I lose all bandwidth because all user install it > I have ASA 5520.