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FWP_E_DUPLICATE_CONDITION
FWP_E_DUPLICATE_CONDITION means that one WFP filter contains more than one condition operating on the same field. The engine rejects the ambiguous or redundant expression rather than guessing whether the conditions should be intersected, unioned, or given an implicit precedence.
Typical source
Policy merging code often appends conditions from several templates or retries an update by adding instead of replacing. The final rule may look plausible in a log because each individual condition is valid, while the combined filter violates WFP’s one-condition-per-field rule.
Repair intentionally
- Dump the final filter after all templates and overrides are applied, grouped by field key.
- Represent a single range or alternative set using the WFP construct that the field supports, rather than duplicating the same field condition.
- Split semantically separate alternatives into separate filters when that preserves the intended policy and arbitration order.
Microsoft: WFP error codes · Microsoft: filter object construction · Microsoft: policy organization and sublayers
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