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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
The declared return type and source header determine the relevant status namespace.
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 the numeric value, declared return type, and first returning operation together with ERROR_SECCORE_INVALID_COMMAND; the same integer can belong to a different status namespace in another API.
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 success observed only after such a change is useful comparison data, but it does not identify the original cause.
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.
How nearby outcomes differ
| Observed comparison | Next conclusion to test |
|---|---|
| The first control changes the result | Concentrate on the variable isolated by this check: Send the minimum documented command for the negotiated version. |
| The second comparison reproduces the same first status | Preserve lower-layer provider, driver, service, or runtime evidence before editing application data. The second controlled check was: Remove optional flags or extension fields while retaining the command ID. |
| A different status appears after the bounded change | The operation moved to another boundary after the third controlled check. That check was: Compare producer and consumer builds to identify a version-skew boundary. Retain both results and interpret the replacement through its own API contract. |
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. Modify only the object, argument, policy, provider, or lifecycle state identified by the collected evidence.
Acceptance criterion. The supported command is recognized, version negotiation is explicit, and an intentionally unknown ID is rejected without destabilizing the security service. Re-run the original operation that produced this condition under its original identity and supported configuration, then keep one negative control that still produces the expected neighboring outcome.
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 boundary 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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