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ERROR_CONNECTION_UNAVAIL
Persistent WNet connections are profile state. With CONNECT_UPDATE_PROFILE, Windows remembers successful redirected local-device connections and attempts to restore them at later logons. A remembered mapping can therefore exist even when the remote server is offline or the restore attempt has not produced a live connection.
This code is valuable because it separates configuration from connectivity. Removing the remembered mapping may make the symptom disappear from Explorer, but it does not explain why restoration failed. Query the stored target and test that UNC resource directly under the same user context.
Check remembered versus active state
- Record the local device and remembered remote resource.
- Test direct access to the UNC target under the same logon session.
- Check whether the connection was restored during logon and which credential source was used.
- Compare with ERROR_DEVICE_ALREADY_REMEMBERED, which reports a profile collision for a local device.
WNetAddConnection2 · Samba standalone server and guest shares · Windows MUP and UNC prefix resolution
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