Microsoft today officially announced a piece of news that came as very little surprise to anyone who has been paying attention for the last year. On May 25th of 2011, Gartner broke an unsubstantiated claim that they had been told by Microsoft that there would be no future release of Forefront Threat Management Gateway (TMG).
Microsoft finally confirmed that information. Although the TMG product will receive mainstream support until April 14, 2015 (a little bit more than 2.5 years from time of writing), it will no longer be available for sale come December 1, 2012.
Why do Exchange people care? Because TMG was the simple, no-brainer solution for environments that needed a reverse proxy in a DMZ network. Many organizations can’t allow incoming connections from the Internet to cross into an interior network. TMG provided protocol-level inspection and NAT out of the box, and could be easily configured for service-aware CAS load balancing and pre-authentication. As I said, no-brainer.
TMG had its limitations, though. No IPv6 support, poor NAT support, and an impressively stupid inability to proxy all non-HTTP protocols in a one-armed configuration. The “clustered” enterprise configuration was sometimes a pain-in-the ass to troubleshoot and work with when the central configuration database broke (and it seemed more fragile than it should be).
The big surprise for me is that TMG shares the chopping block with the on-server Forefront protection products for Exchange, SharePoint, and Lync/OCS. I personally have had more trouble than I care for with the Exchange product — it (as you might expect) eats up CPU like nobody’s business, which made care and feeding of Exchange servers harder than it needed to be. Still, to only offer online service — that’s a telling move.