Update Essentials 2012 R2 Dashboard to be compatible with current .NET releases
If any .NET version after 4.5.2 is installed, some dashboard functionality fails (can't remove computer, can't ignore alert) and the dashboard crashes randomly. Removing and blocking .NET 4.6.1, 4.7, and 4.7.1 works around the issue, but that means the server is limited to the 4-year-old .NET 4.5.2. This article has more details:
Funny to see this posted last week...I just got bit by this same bug tonight. I have a WSE 2012 R2 that I'm rebuilding for someone and have been wondering why a bunch of things were acting odd and crashing the dashboard.
Will there be a solution that doesn't involve downgrading .NET? A program being hosted on my box needs 4.6.0 or newer, so using 4.5.2 is not an option.