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FWP_E_TYPE_MISMATCH
FWP_E_TYPE_MISMATCH means that an FWP_VALUE0 or FWPM_CONDITION_VALUE0 in the filter definition has the wrong type. A value that looks valid when printed can still be unusable if its type tag, pointer form, byte order, or ownership does not match the condition field.
Inspect type and value together
- Log the condition field key, declared WFP data type, match type, actual value type, and serialized value.
- Reinitialize reusable structures before assigning a new condition so stale union members are not carried into the next filter.
- Check that the target layer supports the condition and that the value representation is the one expected for that field.
Safer construction
Use typed helpers for each supported condition rather than a single unvalidated generic variant structure. Correcting only the displayed value while preserving the wrong type tag will reproduce the same error.
Microsoft: WFP error codes · Microsoft: FWPM_FILTER0 input · Microsoft: filtering-layer schemas
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