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FWP_E_RESERVED
FWP_E_RESERVED — 0x80320029
This code places the first failure in nonzero reserved WFP fields. Operationally, a WFP structure contains data in a member or flag space reserved for the platform and required to be zero.
Meaning in the subsystem
A Windows Filtering Platform management call is defined by the exact FWPM structure revision, layer, sublayer, action, conditions, provider context, and BFE transaction. Zero-initialization and backing-buffer lifetime matter because the engine validates the submitted object graph, not the caller’s high-level intent.
Unsupported flags are named semantic values; reserved-field failure often indicates initialization or version-layout misuse.
Minimum useful evidence
- Structure type/version, complete byte dump with sensitive fields redacted, and SDK definition
- Initialization method, packing, size, and uninitialized padding risk
- Flags and reserved members added by wrappers or deserialization
- Caller/compiler architecture and header/runtime version
Identifiers, timestamps, versions, counts, state flags, hashes, and redacted paths normally provide enough correlation. Keep credentials, private keys, message bodies, recovery material, and personal data out of routine incident logs.
Isolate the responsible condition
- Zero-initialize the full documented structure before assigning fields.
- Compare native SDK construction with the language wrapper output.
- Run memory-initialization diagnostics to detect uninitialized bytes.
Regression proof
Apply the smallest change that addresses the first rejected condition: Use the runtime-appropriate structure revision, zero all reserved storage, and avoid copying larger/newer structures into older APIs.
Close the incident only when the same object succeeds across supported architectures and poisoned-reserved-field tests are rejected deterministically.
Technical references
These references define the HRESULT family and subsystem contract used above:
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