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ERROR_DEV_NOT_EXIST
A redirected drive or remote resource has state beyond its path string. MPR/WNet can associate a local device with a remote resource, while the underlying redirector maintains the actual remote connection. The local name may therefore still be known even after the server, share, or transport path that backed it has disappeared.
Check both sides of that association. Enumerating or querying the mapped device answers whether Windows still knows the local mapping; direct access to the UNC target answers whether the remote resource can still be claimed and connected. Deleting and recreating a drive letter without testing the UNC target can merely mask the original loss.
Differentiate mapping from resource loss
- Record the local device name and its associated remote name.
- Test the UNC target directly, without the mapped drive letter.
- Check whether the provider or Workstation service was restarted between success and failure.
- For SMB, correlate the failure with transport disconnect and tree/session invalidation events.
WNetAddConnection2 · Windows MUP and UNC prefix resolution · MS-SMB2 network disconnect handling
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