I blogged in October 2016 and February 2018 about incompatibilities between the Essentials 2012 R2 dashboard and .NET 4.6 and 4.7. I’ve now confirmed that under Server 2016 Standard with the Essentials role, the dashboard is incompatible with .NET 4.7.1. Once .NET 4.7.1 is installed (by installing the May 8, 2018 rollup KB4103723 or a later rollup), you will no longer be able to ignore alerts.
Downgrading to .NET 4.7 should solve this issue, but because 4.7.1 was included in a rollup, you may have to uninstall several updates to roll back to 4.7. It’s probably easier to remove 4.7 altogether.
Note Any change to .NET could cause issues with server applications or components. Proceed at your own risk!
Determine Your .NET Version
On Server 2016, open a PowerShell prompt and run this on one line (you can also directly inspect the value in regedit if you prefer):
Get-ChildItem "HKLM:SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\" | Get-ItemPropertyValue -Name Release
Compare to the Release numbers for Server 2016 in this article. Here is an abbreviated list:
394802 – 4.6.2 – Initial version for Server 2016
460805 – 4.7 – installed by stand-alone update KB3186568
461310 – 4.7.1 – installed by May 8, 2018 rollup KB4103723 or a later rollup
Block Installation of .NET 4.7 and Later
Save the following text to a file named “Block .NET 4.7.reg” and merge it to your server.
Update May 17, 2019 Added block for .NET 4.8, released May 10, 2019.
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\WU] "BlockNetFramework47"=dword:00000001 "BlockNetFramework471"=dword:00000001 "BlockNetFramework472"=dword:00000001 "BlockNetFramework48"=dword:00000001
Downgrade to .NET 4.6.2
If your .NET version is 4.7 or later, open Control Panel > Programs and Features > Installed Updates, search for KB3186568, and uninstall it:
Note I did this after uninstalling and blocking .NET 4.7.1, before deciding to uninstall 4.7 as well. If you are not able to directly uninstall KB3186568, you may need to uninstall the May 2018 (and following) rollups first. This article has further information about uninstalling and blocking .NET 4.7 (for Microsoft Exchange compatibility).
Run the PowerShell command again to confirm that you are on .NET 4.6.2.
You should now be able to hide dashboard alerts.
As long as the “BlockNetFramework” registry entries are in place, when you apply update rollups, they will no longer install .NET 4.7, 4.7.1, or 4.7.2. KB3186568 does not re-install.
Even after uninstalling 4.7, you will not be able to re-activate hidden alerts. The progress bar just runs forever:
You may also get dashboard crashes.
As a workaround, delete the alert. It should be re-detected if the condition still exists.
Can’t delete the alert either, again seeing an endless progress bar? Try to re-activate it. That worked for me one time.
Update 17 July 2018
.NET 4.7.2 is releasing to Windows 10 1607 this month via Windows Update, but it looks like so far it it is only available from the Windows Catalog for Server 2016. See this article. Be prepared by blocking .NET 4.7.2 in the registry as shown above.
Add your vote to the UserVoice issue here:
Update October 26, 2018
As mentioned above, even with .NET 4.6.2 on Server 2016 with the Essentials role, I am unable to ignore alerts. This time I did not want to delete it; I need to permanently ignore it. I decided to try the My Server 2012 R2 app. I installed the app from the Microsoft Store on a Windows 10 Pro 1803 machine, logged on the the (remote) 2016 server, and chose Ignore:
The warning changed from yellow to gray in the dashboard: