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STATUS_FWP_RESERVED
The policy structure carries state that the current API version does not accept
STATUS_FWP_RESERVED is a structural ABI error. WFP reserves fields for future use, and callers must not populate them with application flags, stale stack bytes, or serialized data from another SDK layout. The failure does not identify a network policy decision; it shows that BFE rejected the object representation before installation.
Use explicit zero-initialization for every WFP structure and assign only documented members. Copying a partially initialized structure, persisting raw binary WFP structures, or passing a newer layout to an older runtime are common ways to make a reserved field nonzero without an obvious source-level assignment.
What to inspect
- The exact structure version, target platform, and compiler packing assumptions.
- The initialization path before individual fields are set.
- Whether the policy format stores raw binary structures instead of logical fields.
- The raw bytes of the rejected structure when debugging version or padding issues.
References
- Microsoft: WFP error codes
- Microsoft: WFP API overview and headers
- Microsoft: FWPM_FILTER0 reserved member
- Microsoft WFPSampler source
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