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WU_E_DM_NONETWORK
WU_E_DM_NONETWORK is raised when the download manager cannot use a network connection at the required time. It does not distinguish a disconnected interface, proxy issue, DNS failure, VPN transition, or policy restriction.
What to check
- Correlate the failure time with network-interface changes, VPN reconnects, sleep/resume, and system proxy changes.
- Determine whether the device uses Microsoft Update directly or an intranet WSUS endpoint, then test that exact route.
- Look for a more specific lower-level WinHTTP, DNS, or proxy result immediately before this code.
Microsoft: Windows Update error reference
Microsoft: Windows Update log files
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