Using the Login Servers that those programs use is the best way to Block them. Many of the IM's out there use a "Scanning" technique for port available to IM so blocking certain ports will not work.
If blocking IM becomes an issue, you can provide an Internal IM solution. Hope that helps. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Douglas A. Jones Sent: Friday, April 16, 2004 1:29 PM To: Exchange Discussions Subject: RE: Disabling Instant Message & 3rd Party email access It runs the whole IM on whatever port it can find. The place I'm consulting right now blocks pretty much everything and you need to a username password to get out on TCP 80 (http). But Yahoo works; it seems that you can get out on TCP 23 (Telnet) without any authentication here, so it uses that. -Doug Jones -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tony Hlabse Sent: Friday, April 16, 2004 11:53 AM To: Exchange Discussions Subject: RE: Disabling Instant Message & 3rd Party email access Yea looks like they use port 80 for file transfers and who know what else. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Douglas A. Jones Sent: Friday, April 16, 2004 11:51 AM To: Exchange Discussions Subject: RE: Disabling Instant Message & 3rd Party email access Except for Yahoo which search a bunch of ports (including TCP 80) to find one to connect to the yahoo messaging servers. It's my understanding the best way to stop Yahoo Messenger is to block the hosts that it goes to. Do a Google search for them and you'll find them easily. -Doug Jones -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tony Hlabse Sent: Friday, April 16, 2004 11:44 AM To: Exchange Discussions Subject: RE: Disabling Instant Message & 3rd Party email access Most IM software's use specific port(s) that can be blocked. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Hilda De Nigris Sent: Friday, April 16, 2004 11:44 AM To: Exchange Discussions Subject: Disabling Instant Message & 3rd Party email access We are currently looking into disabling all Instant Messaging and any 3rd party email access from our user desktops. Any information you can provide would point us in the right direction. _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&; lang =english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with. _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&; lang=english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. 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