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STATUS_FLT_INSTANCE_NAME_COLLISION
STATUS_FLT_INSTANCE_NAME_COLLISION is an identity conflict. The requested instance name is already in use, so Filter Manager cannot create another instance with that identifier even if the desired altitude is otherwise free.
Compare the configured instance name, filter name, target volume, and altitude separately. An instance is an attachment of one minifilter to one volume; its name must not be treated as a harmless display label. Duplicate INF configuration, stale service configuration, and an explicit debug attach while an automatic instance already exists are typical causes.
Recommended checks
- Enumerate current filter instances before creating another one.
- Check that the configured instance name is unique and matches the deployed package.
- Do not solve a name collision by changing altitude unless stack ordering was also intended to change.
FltAttachVolumeAtAltitude | Loading and unloading minifilters | NTSTATUS reference
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