Server 2012 Essentials stopped accepting SSTP connections after automatic certificate renewal using Win-Acme. Found many services weren’t starting.

The fix was to:

1. Via MMC, copy new certificate from Web to Personal.
2. In elevated CMD, go to c:\Program Files\Windows Server\Bin
3. WSSPowerShell.exe
4. Add-WssLocalMachineCert

The process takes a while and may produce errors at the end. However, after it finishes and the server is restarted, all was well.

This was developed using this very helpful blog post:

https://windowsserveressentials.com/2013/04/29/windows-server-2012-essentials-an-error-prevented-the-dashboard-from-opening/