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How do I block Internet Web browser mail, such as AOL, MSN, Excite, etc., and Internet chat with a C

How do I block Internet Web browser mail, such as AOL, MSN, Excite, etc., and Internet chat with a Cisco Pix?

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The best way is to allow access to all users for some time, say a week. Enable full logging on the firewall. Then check the logs to find out what messenger/mail services are being connected to on what port numbers. Now you can block those. You might have to check the logs once in a while as all of them keep changing IP addresses for security reasons. As far as mail is concerned, you can try blocking all requests with the word "mail" in them.

This was first published in July 2004

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