I'm trying to block IM (MSN) traffic on a Cisco ASA5520 with Software Version 7.2(4)
The configuration which is provived in the following link:
Its perfect to block IM traffic, the issue is that i could see that the MSN after been blocked, encapsulates himself in HTTP traffic using port 80 and therefore is able to establish the connection.
I guess i have to inspect HTTP traffic for something and discard that "something", i would like to have a litle help on how to acomplish this and if you guys think that making a rules to open every HTTP packet to see if there's an connection attemptive to MSN gets connected, isn't going to overload the ASA Hardware?
Thanks for everything