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Windows Update failing on Session Host.

Trying to update my Remote App servers for the CREDSSP update that broke RDP.
Anyways...the Gateway Server and Management Server both updated. They are 2016.
The Session Hosts are Server 2012R2 and will not update.  The update installs and then needs a restart to finish.
After the restart the updates says failed.  I have 6 session Hosts and this is happening on all of them.

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Cliff Galiher
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If it's happening on all of them then I'd strongly suspect software installed on the session host interfering. Management agents. Antivirus. Similar. Possibly a LOB app, but much less likely. Make sure that no users are logged on and that logons are disabled for new sessions when updating.
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How do I disable new sessions?
I tried logging onto the management server, right-clicking the session host, and selecting false, but that doesn't work.  Users can still log into that machine.
Since I thought Cliff would answer, I did not respond.
You can stop the "remote desktop services" service and instead logon to the console for the time of updating.
But I doubt very much that this will make a difference and would recommend to try the steps I outlined right away.