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ERROR_CLOUD_FILE_UNSUCCESSFUL
A nonspecific provider failure reached the platform
ERROR_CLOUD_FILE_UNSUCCESSFUL is the generic cloud-operation failure. CFAPI documentation states that provider completion codes outside the supported STATUS_CLOUD_FILE_* range are converted to the generic unsuccessful status. It can therefore hide a provider bug in error mapping as well as a remote operation that truly lacks a more precise cloud status.
Log the provider's original internal error before it is passed to CfExecute, together with callback type, transfer key, file identity, offset, and remote request ID. Map authentication, network, validation, cancellation, and resource failures to their specific cloud statuses where possible. Diagnosing only the Win32 result after conversion loses the distinction needed to fix the provider or service.
What to inspect
- Capture the original provider error before CFAPI completion-status conversion.
- Use a specific STATUS_CLOUD_FILE value whenever the failure category is known.
- Correlate generic failures with remote request IDs and provider callback telemetry.
References
- Microsoft: unsupported completion statuses become unsuccessful
- Microsoft: callback-specific request categories
- Microsoft: Cloud Filter API operation model
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