How do you upgrade from UAG 2010 SP1 to UAG 2010 SP2? Well, it appears that such upgrade is not as trivial as expected.
First, Microsoft UAG is based on another Microsoft product – Microsoft TMG, – which has to be upgraded separately. Besides that, there is no direct upgrade package for the UAG itself. Thus, the correct upgrade path would be as follows: UAG SP1 => UAG SP1 Update 1 => TMG SP2 => UAG SP2. Of course, the whole process is documented in TechNet – but you have to be aware about this upgrade path first…
There is another caveat in this upgrade. In case you have some UAG trunks configured (and I assume you have some, since what do you need UAG for otherwise?), you have to active UAG configuration after each step in the upgrade process, otherwise you’ll end up without configured trunks – they will disappear silently during the process. Thanks to TechNet forums for solving this one for me!
