In an attempt to track down this event:
I get this result:The IP address lease 192.168.1.105 for the Network Card with network address 0x40F02F89E7F7 has been denied by the DHCP server 192.168.1.1 (The DHCP Server sent a DHCPNACK message).
Note that the MAC address that received the DHCPNACK message is reported as disconnected. It is for a wireless card. After power cycling the router the IP address lease had been cleared. Once the system with the disconnected media was booted the router shows the MAC address & the error reappears.>getmac
Physical Address Transport Name
40-F0-2F-89-E7-F7 Media disconnected
From ipconfig, the MAC address is for the Microsoft Wi-Fi Direct Virtual Adapter. This adapter is not displayed in "Change adapter settings" so there's no way to get at it.
What is going on here? How is it that disconnected media are requesting an address?
Resolution: I discovered I was not paying sufficient attention to the fact that the wireless adapter was shown as "Not connected" in Control Panel, Network connections. That did not mean the adapter was disabled. Now that it is disabled I no longer get the DHCPNACK message! D'oh!