Security Basics mailing list archives
Re: Blocking Instant Messaging Applications
From: "Gaddis, Jeremy L." <jeremy () linuxwiz net>
Date: Mon, 21 Nov 2005 20:04:05 -0500
Alloishus BeauMains wrote:
At the PIX or firewall, or wherever your ACLs are kept, block incoming or outgoing traffic to oscar.aol.com, the messenger login servers, trillian, yahoo, etc etc etc.
Unfortunately, this method also has a great deal of administrative overhead. Do a lookup on messenger.hotmail.com. Do another lookup two weeks from now. A beer says that the IPs will differ. Trying to keep up with this is futile. If you don't believe me, see MS KB Article #889829 (http://support.microsoft.com/default.aspx/kb/889829). I implemented this on February 13th. It worked for perhaps a month.
Heck, just checked and that article isn't even available anymore. It's referenced at http://www.microsoft.com/security/incident/im.mspx, but clicking on the link gets you to an error page.
Thanks, -j -- Jeremy L. Gaddis, GCWN http://www.linuxwiz.net/ "If it's not on fire, it's a software problem."
Current thread:
- Blocking Instant Messaging Applications Gaddis, Jeremy L. (Nov 21)
- RE: Blocking Instant Messaging Applications Murad Talukdar (Nov 22)
- <Possible follow-ups>
- RE: Blocking Instant Messaging Applications Nick Duda (Nov 21)
- RE: Blocking Instant Messaging Applications Murad Talukdar (Nov 22)
- RE: Blocking Instant Messaging Applications Aditya Deshmukh (Nov 24)
- Re: Blocking Instant Messaging Applications Gaddis, Jeremy L. (Nov 22)
- RE: Blocking Instant Messaging Applications Murad Talukdar (Nov 22)
- Re: Blocking Instant Messaging Applications Neksus (Nov 21)
- Re: Blocking Instant Messaging Applications Alloishus BeauMains (Nov 22)
- Re: Blocking Instant Messaging Applications Gaddis, Jeremy L. (Nov 22)
- RE: Blocking Instant Messaging Applications Aditya Deshmukh (Nov 24)
- Re: Blocking Instant Messaging Applications Gaddis, Jeremy L. (Nov 22)
- RE: Blocking Instant Messaging Applications Alexis Villagra - VILSOL LatinAmerica (Nov 22)
- Re: Blocking Instant Messaging Applications Alloishus BeauMains (Nov 22)
- RE: Blocking Instant Messaging Applications Collier, Simon (Nov 22)
- RE: Blocking Instant Messaging Applications Aditya Deshmukh (Nov 24)
- RE: Blocking Instant Messaging Applications Hartmann (Nov 25)
- RE: Blocking Instant Messaging Applications Aditya Deshmukh (Nov 24)
- RE: Blocking Instant Messaging Applications Beauford, Jason (Nov 23)
- RE: Blocking Instant Messaging Applications Murad Talukdar (Nov 24)
- Re: Blocking Instant Messaging Applications Neksus (Nov 23)