NTSTATUS 0xC01C0007 (STATUS_FLT_NOT

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Description:

a minifilter attempted registration before the Windows Filter Manager was initialized

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STATUS_FLT_NOT_SAFE_TO_POST_OPERATION	STATUS_FLT_FILTER_NOT_READY

STATUS_FLT_NOT_INITIALIZED

This is a driver-startup condition. A minifilter attempted to register while Filter Manager was not initialized, so no volume attachment or file I/O diagnosis should begin until the driver-loading and service dependency path is fixed.

Record the failing routine, driver load order, service configuration, and the first registration status from DriverEntry. Do not mask the problem by continuing with a partially initialized filter handle: later calls can turn a deterministic startup defect into lifetime or teardown failures.

Useful checks

Verify that the installed image is a minifilter built and registered for Filter Manager.
Verify the return from FltRegisterFilter before calling any filtering or instance API.
Use load/unload logs to distinguish a missing Filter Manager dependency from a prior failed driver initialization.

Loading and unloading minifilters | FltStartFiltering | NTSTATUS reference

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