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FWP_E_IN_USE
FWP_E_IN_USE means the WFP object cannot be deleted because other objects still reference it. This is a dependency error, not a signal that the Base Filtering Engine is permanently locked or that a reboot is required.
Find the dependents
Typical relationships include filters that reference a callout, a sublayer, a provider context, or a provider. Microsoft documents that a callout cannot be removed while filters still specify it for an action. The correct cleanup sequence follows those references rather than deleting objects in arbitrary order.
Safe cleanup
- Enumerate filters and related policy objects belonging to the product’s provider.
- Delete or update dependent filters first, then remove the now-unreferenced context, callout, sublayer, or provider.
- Perform a coherent uninstall or rollback in an explicit transaction where the API permits it.
Microsoft: WFP error codes · Microsoft: callout deletion dependencies · Microsoft: transactional cleanup guidance
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