I did not know this, but it turns out Mircrosoft keeps a list of all the ports that various MS services use. This
list is available for download as an Excel spreadsheet from the Microsoft site.
by LonerVamp 08.22.04 at 10:14 AM in
/general
Good find, never saw that document before. Too bad it doesn't include the ports used by Windows Small Business Server 2003. You can find a list of those ports at http://thebackroomtech.wordpress.com/2008/06/04/ports-to-open-on-a-firewall-for-sbs-2003-communication/