Jia Liu Tue, 09/14/2010 - 18:21

Ultrasurf is all https so you won't be able to use acls on the ASA to block it while permitting legitimate traffic.  Cisco Ironport Web Security Appliances can do HTTPS proxy and it may be able to block these HTTPS connections.

Denis Spichkin Wed, 09/15/2010 - 06:23

In ASA this is such feature as Regular Expressions with MPF (regexp)

may be it help you.

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