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FWP_E_INVALID_ACTION_TYPE
FWP_E_INVALID_ACTION_TYPE means that the filter action value is not one of the actions permitted for the filter. It is not a result returned because traffic was allowed or blocked; the filter definition itself is invalid before it can participate in classification.
Check the full action contract
- Verify the action type together with the selected layer, sublayer, and whether the filter references a callout.
- Do not use a callout action without the required callout relationship and registration sequence.
- Check that the policy generator initializes the complete action union and does not retain a value from a reused structure.
Correctness before priority
Repair the action to express the intended permit, block, or callout behavior at the chosen layer, then validate filter arbitration and weight separately. A valid action at the wrong layer will still fail with a layer compatibility error.
Microsoft: WFP error codes · Microsoft: filters and callout actions · Microsoft: FwpmFilterAdd0 action rules
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