HRESULT 0xC00E0002 (MQ_ERROR_PROPERTY): meaning and diagnosis

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One or more of the properties passed are invalid.

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MQ_ERROR	MQ_ERROR_QUEUE_NOT_FOUND

MQ_ERROR_PROPERTY

Interpretation

The important part of MQ_ERROR_PROPERTY is not only whether the call failed, but which MSMQ subsystem had enough information to return this specific result. In this case the decisive subject is aggregate invalid-property failure. One or more per-property aStatus values contain the actionable result.

For MQ_ERROR_PROPERTY, the property namespace is split among message, queue, computer, private-computer, and management properties. When diagnosing MQ_ERROR_PROPERTY, A numeric identifier meaningful in one structure is not automatically legal in another API.

When diagnosing MQ_ERROR_PROPERTY, validation occurs in layers: identifier recognition, variant type, buffer shape, value range, required companions, and operation eligibility. In the MQ_ERROR_PROPERTY path, these layers correspond to different MSMQ HRESULTs and different fixes.

Relevant API contract

Subsystem	MSMQ property arrays and their parallel identifier, value, and status elements
Decisive boundary	the property identifier, VARTYPE, value, operation, and buffer ownership are validated separately
Code-specific focus	aggregate invalid-property failure
Primary recovery rule	Report the property identifier and status together instead of exposing only MQ_ERROR_PROPERTY.

When diagnosing MQ_ERROR_PROPERTY, do not merge this result with other property failures: identifier, VARTYPE, value, size, required companions, and operation eligibility are diagnosed by different codes. For MQ_ERROR_PROPERTY, the code-specific boundary is aggregate invalid-property failure.

Decisive observations

The complete apropid/apropvar/astatus triples in original order; associate it explicitly with MQ_ERROR_PROPERTY.
When diagnosing MQ_ERROR_PROPERTY, the api name and whether the structure was input, output, or both; capture the value before cleanup or retry changes it.
In the MQ_ERROR_PROPERTY path, the first failing property rather than only the aggregate hresult; compare it with a known-good call using the same account and queue type.
For this MQ_ERROR_PROPERTY result, record the queue path or format name, local/remote placement, transactional flag, caller SID, process build, and UTC correlation ID when they apply.

For MQ_ERROR_PROPERTY, log certificate thumbprints, provider names, SIDs, GUIDs, lengths, and hashes where useful, but do not log private keys, symmetric keys, credentials, or confidential message bodies.

Troubleshooting workflow

Record the unsigned HRESULT, MQ_ERROR_PROPERTY, and the native API or COM method before a framework replaces it with a generic exception.
Reproduce with the smallest queue/message/property set that still returns MQ_ERROR_PROPERTY; change one precondition at a time.
In the MQ_ERROR_PROPERTY path, verify the postcondition after the failed call: queue existence, message presence, directory object state, transaction outcome, or generated output may differ by result.
For this MQ_ERROR_PROPERTY result, capture the API name and whether the structure was input, output, or both.
For MQ_ERROR_PROPERTY, capture the first failing property rather than only the aggregate HRESULT.
Apply the code-specific recovery rule: Report the property identifier and status together instead of exposing only MQ_ERROR_PROPERTY.

Recovery rules

Report the property identifier and status together instead of exposing only MQ_ERROR_PROPERTY.

When diagnosing MQ_ERROR_PROPERTY, do not hide this HRESULT behind an unlimited framework retry. In the MQ_ERROR_PROPERTY path, require a verified precondition change and preserve the original correlation identifier across the next attempt.

Differences that matter

In the MQ_ERROR_PROPERTY path, changing a queue ACL or restarting the service does not correct an invalid identifier, VARTYPE, value, structure, or property combination. The specific focus for MQ_ERROR_PROPERTY remains aggregate invalid-property failure.

In the MQ_ERROR_PROPERTY path, changing queue names, deleting directory objects, or recreating certificates without reconciliation can create a second object while callers still reference the first.
For this MQ_ERROR_PROPERTY result, A successful test under an interactive administrator account does not prove that the production service account has the same profile, token, directory access, or key permissions.

Practical scenario

A wrapper building mqpropvariant arrays encounters MQ_ERROR_PROPERTY. For MQ_ERROR_PROPERTY, it logs the rejected property index and rebuilds the request from a typed schema instead of retrying the same arrays. When diagnosing MQ_ERROR_PROPERTY, the acceptance test then changes only the decisive precondition and confirms both the HRESULT and the actual queue/message state.

A regression test should force MQ_ERROR_PROPERTY, assert the raw value and relevant outputs, then correct only the documented precondition and verify the intended success or neighboring HRESULT.

Sources

Microsoft: MSMQ message properties — source used for the MQ_ERROR_PROPERTY analysis.
Microsoft: MQCreateQueue — source used for the MQ_ERROR_PROPERTY analysis.
Microsoft: Message Queuing error and information codes — source used for the MQ_ERROR_PROPERTY analysis.
Microsoft: queue properties and MQQUEUEPROPS — source used for the MQ_ERROR_PROPERTY analysis.

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