Remote Desktop Services: Shadowing fails with unknown error

With the new Microsoft patches for Spectre and Meltdown, many will see that they can no longer shadown their users with Terminal Server / Remote Desktop Services, all they will get is this:

“Shadow error: Unspecified error”

Only solution, as of the time of writing is to install theese KB’s on their respective system:

Windows Server 2012 R2 (KB4057401):

Windows Server 2016 (KB4057142):


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