Security Basics mailing list archives
RE: Blocking Instant Messaging Applications
From: "Beauford, Jason" <jbeauford () EightInOnePet com>
Date: Tue, 22 Nov 2005 15:25:33 -0500
Use DNS to resolve them (hostnames like oscar.aol.com) to a local-non-existent address. Or just block the associated outgoing ports at the firewall. Or use a thirdparty filter like: SurfControl or Websense JMB | -----Original Message----- | From: Gaddis, Jeremy L. [mailto:jeremy () linuxwiz net] | Sent: Monday, November 21, 2005 8:04 PM | To: Alloishus BeauMains | Cc: security-basics () securityfocus com | Subject: Re: Blocking Instant Messaging Applications | | 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/
Current thread:
- Re: Blocking Instant Messaging Applications, (continued)
- Re: Blocking Instant Messaging Applications Gaddis, Jeremy L. (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)