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How do I stop instant messenger clients with an ASA?

I need to stop my internal users from using AOL, MSN and Yahoo instant messenger clients. I understand it can be done using QOS but I have not been able to get it working correctly. I see how I can stop MSN and Yahoo by using the “service” option but how do I stop AOL? Also, I need to stop IMs even if the user changes the port, any ideas?

My ASA is running 7.2(2) and I am willing to upgrade if needed.

Thanks in advance!

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Re: How do I stop instant messenger clients with an ASA?

You should be able to do this with the MPF and application level inspection maps. Check out this link for more information and some pretty good guidelines.

<http://www.cisco.com/en/US/docs/security/asa/asa80/configuration/guide/inspect.html#wp1479354>

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