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FWP_E_INVALID_ENUMERATOR
FWP_E_INVALID_ENUMERATOR means a field declared as an enumeration contains an unsupported value. Common causes are uninitialized structures, an enum value introduced on a newer Windows release, or a value from the wrong API structure.
What to verify
- Zero-initialize the exact WFP structure before setting documented fields.
- Compile against the intended SDK and verify that the selected enum is supported on the target operating system.
- Log both the field value and the API version used when the call fails.
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