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ERROR_NO_NETWORK
WNet APIs use ERROR_NO_NETWORK for provider/network unavailability. For example, WNetGetResourceInformation can return it when the network is unavailable, and WNetGetProviderName documents it when the network is unavailable. This is broader than a single remote host being down.
Test the provider layer and multiple resources. If every WNet resource operation fails while local TCP/IP still works, inspect the Workstation/network-provider components rather than blaming one server. Conversely, failure of one host with other network resources working is closer to host/path/connection diagnosis.
Scope the outage
- Try a known-good network resource through the same provider.
- Check provider and redirector service state.
- Compare direct socket connectivity with WNet/UNC resource operations.
- Preserve any provider-specific extended error before restarting networking services.
WNetGetResourceInformation · WNetGetNetworkInformation · Windows network redirector architecture · Windows MUP and UNC prefix resolution
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