That's pretty much what I've found as well..  in the case of AOL IM,
I blocked all outbound traffic to the two IP addreses for login.oscar.aol.com,
fired up an AIM client on a workstation and told it to "find a way around the 
firewall".
It tried pretty damn hard, but was unable to connect.

Ron

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        Ron Brown
        Midrange Systems Specialist     Maine Medical Center
        Firewall/VPN Administrator      Information Services
        Voice:  (207) 871-6630          420 Cumberland Avenue
        FAX:    (207) 871-6592          Portland, Maine 04101
        Email:  [EMAIL PROTECTED]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

>>> [EMAIL PROTECTED] 02/08/02 08:31AM >>>
Good morning,

  i have been doing alot of searching and think that i have
come to the correct conclusion that there is currently no way
of blocking messenger services such as AIM and MSN Messenger
except by blocking access to the IP addresses for their servers.

  Can someone confirm this for me?

thanks,
dean


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