How can I block Ultrasurf using the ProxySG appliance?
Ultrasurf is an Internet based privacy and security tool designed to circumvent network security/surveillance. The ProxySG alone cannot block Ultrasurf, since it is able to utilize UDP in order to connect to the Ultrasurf network. You'll need to use a multi-layered approach to network security in order to block Ultrasurf.
The following conditions will need to be met before Ultrasurf can be blocked:
The ProxySG will intercept Ultrasurf traffic and detect it as SSL. However, since it's not an SSL protocol that the ProxySG fully understands, the connection will be dropped. This occurs for every port Ultrasurf tries via TCP.
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