Plugin update freeze. Only continues after Windows Server reboot.

Please install this fix from Microsoft to resolve the issue:

 

Here is a list of patches for that issue per OS version:
2008 SP2: https://support.microsoft.com/en-us/help/4345397/improvements-and-fixes-for-windows-server-2008-service-pack-2

2008R2: https://support.microsoft.com/en-us/help/4345459/stop-error-0xd1-after-a-race-condition-occurs-in-windows-7-service-pac

2012R2: https://support.microsoft.com/en-us/help/4345424/improvements-and-fixes-windows-8-1-and-server-2012-r2

2012 Non-R2 is here: https://support.microsoft.com/en-us/help/4345425/improvements-and-fixes-windows-server-2012

2016: https://support.microsoft.com/en-us/help/4345418/july162018kb4345418osbuild143932368

 

You might run into this after the server reboot.

FIX: Stuck at spinning wheel at login.