My problem is solved.
I did not have to Repair Windows.
I systematically checked to ensuire the following were correctly set:
- DNS Client service started and on automatic
- SSDP Discovery service started and on automatic
- UPnP Device Host service started and on automatic
- Function Discovery Resource Publication service started and on automatic
I also confirmed that IP version 6 was enabled.
One or more of these actions corrected the flaw.
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