didyap Wed, 09/12/2007 - 13:18

No, PIX cannot block Skype. Skype has the capacity to negotiate dynamic ports, and to use encrypted traffic. With encrypted traffic, it's virtually impossible to detect it as there are no patterns to look for. You could eventually use a Cisco IPS (Intrusion Prevention System). It has some signatures that are able to detect a Windows Skype Client that connects to the Skype server to synchronize its version.

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