UPDATE: KB – the June 2016 update rollup KB 3161606  June 2016 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2  contains the fix for this. See KB3162871 RD Gateway Manager console crashes with the latest .NET Framework 4.6.1 update on Windows Server 2012 R2 

Apparently the Exchange console and Skype for Business Server  2015 is not the only victim of Microsoft pushing out the .NET framework 4.6.1 update (KB3102467) to servers via Windows updates and WSUS. A colleague of mine described Windows updates as a game of Russian roulette, indicating there’s al least a QA concern …

The most recent victim I found was the RD Gateway management console on Windows Server 2012 R2. You might have the same issue on older Windows Versions but I’m only running W2K12R2 (it’s 2016 after all).

The result is that when you’re editing a Connection Authorization Policies or Resource Authorization Policies their membership settings (adding/removing groups) the MMC just crashes. Creating new ones is equally problematic!

You see the following errors logged in the event viewer:

Faulting application name: mmc.exe, version: 6.3.9600.17415, time stamp: 0x54504e26
Faulting module name: clr.dll, version: 4.6.1055.0, time stamp: 0x563c12de
Exception code: 0xc0000409
Fault offset: 0x00000000002fdbd8
Faulting process id: 0x12ec
Faulting application start time: 0x01d166820b2de977
Faulting application path: C:\Windows\system32\mmc.exe
Faulting module path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll
Report Id: 57bbb59c-d275-11e5-9440-00155dd2ca06
Faulting package full name:
Faulting package-relative application ID:

Followed by

The culprit once again is the .NET Framework  4.6.1 update (KB3102467)  for Microsoft Windows.

Get rid of that update to restore functionality. Come on Microsoft, Quality assurance! You need people to update ever faster for both security reasons and in order to keep up with technologies and the cloud cadence. You need to make sure they can do so without worrying all the time!