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ERROR_SECCORE_INVALID_COMMAND
unrecognized user-mode security-core command identifies a scoped API or runtime boundary rather than a general machine failure. The user-mode security-core facility received a command identifier or command envelope it does not implement for the active protocol/version. Because the public SDK exposes little higher-level context, the returning component and exact command ID are essential evidence.
Where the result is produced
Invalid command is not the same as access denied or malformed payload. The receiver does not recognize the requested operation at the command-dispatch layer. Keep ERROR_SECCORE_INVALID_COMMAND, its numeric value, and the first returning operation together.
Scope limit. Do not infer a specific private command set from the symbolic name alone; identify the actual returning API in the trace.
Evidence to preserve
| Capture | Diagnostic value |
|---|---|
| Returning API/component, command identifier, request version, flags, payload length, and caller build. | Identifies the concrete object and operation associated with unrecognized user-mode security-core command. |
| Producer/consumer binary versions and feature negotiation before the command. | Separates argument or lifecycle state from a lower-layer provider failure. |
| Whether the command crossed a broker, RPC, device, or trusted-service boundary. | Creates a stable before-and-after comparison. |
| Trace of one known supported command using the same channel and identity. | Shows whether this condition is the first result or a translated summary. |
Preserve trace of one known supported command using the same channel and identity before reinstalling, rebooting, clearing state, or substituting another device or provider.
A controlled diagnostic sequence
- Send the minimum documented command for the negotiated version. Repeat the original supported operation so the check remains tied to the same API boundary.
- Remove optional flags or extension fields while retaining the command ID. Keep unrelated inputs fixed so the changed result remains attributable to the tested variable.
- Compare producer and consumer builds to identify a version-skew boundary. Record the first returned status and any state transition observed.
Correction and proof
Targeted correction. Use a command and version supported by both endpoints, update the older component, and reject unknown command IDs before sending privileged payloads.
Acceptance criterion. The supported command is recognized, version negotiation is explicit, and an intentionally unknown ID is rejected without destabilizing the security service.
Technical references
References for ERROR_SECCORE_INVALID_COMMAND on the deployed platform version.
- Microsoft Open Specifications: HRESULT values — defines the status namespace used.
- Microsoft: HRESULT facility extraction — documents the API or lifecycle behind this condition.
- Microsoft: Windows security architecture — provides ABI, implementation, or protocol context.
- Microsoft: Windows RPC concepts — supports the portability and verification limits.
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