The following post below describes deployment and configuration of a Forefront TMG SCOM pack to better monitor and evaluate Forefront TMG server functionality and performance.

Links:

http://blogs.technet.com/b/isablog/archive/2009/06/29/tmg-scom-pack-monitor-tmg-with-system-center-2007-r2.aspx

http://www.winserverkb.com/Uwe/Forum.aspx/mom-setup/471/SCOM-Agent-Ports

http://social.technet.microsoft.com/Forums/en-US/systemcenterrom/thread/11e3bd77-f04d-41cc-a5c5-a18cd617baae

http://oostdam.info/index.php/sectie-blog/249-scom-install-agent-on-forefront-tmg-server