NTSTATUS 0xC01C0015 (STATUS_FLT_INSTANCE_NOT

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Description:

the requested minifilter attachment could not be found on the specified volume

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STATUS_FLT_VOLUME_NOT_FOUND	STATUS_FLT_CONTEXT_ALLOCATION_NOT_FOUND

STATUS_FLT_INSTANCE_NOT_FOUND

An instance is the concrete attachment of a minifilter to a volume. STATUS_FLT_INSTANCE_NOT_FOUND therefore means that the requested attachment is absent; it does not necessarily mean that either the minifilter or volume is missing.

Verify the filter identity, target volume, instance name, altitude, and current attach lifecycle. An automatic attachment may have been declined by policy, a manual instance may have been detached, or the intended volume may have remounted with a new object lifetime. Recreate state only after resolving which of those cases occurred.

Useful evidence

The current filter and instance enumeration, not just service configuration.
Attachment logs showing whether STATUS_FLT_DO_NOT_ATTACH was returned.
Volume mount/dismount timing around the failed lookup.

Filter Manager API overview | InstanceSetupCallback | NTSTATUS reference

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