HRESULT 0xC00E009A (MQ_ERROR_TOO_MANY

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Description:

Too many properties passed to the function. Message Queuing can process up to 128 properties in one call.

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MQ_ERROR_RESOLVE_ADDRESS	MQ_ERROR_MESSAGE_NOT_AUTHENTICATED

MQ_ERROR_TOO_MANY_PROPERTIES

Why the exact HRESULT matters

When MQ_ERROR_TOO_MANY_PROPERTIES appears, start with the queue operation and its property arrays rather than with a broad repair of the Message Queuing service. Interpret it as single call exceeds MSMQ property-count limit, not as a general transport outage. The API processes at most 128 properties in the request, including output/length companions.

For MQ_ERROR_TOO_MANY_PROPERTIES, MSMQ uses arrays whose indexes bind a property identifier, an MQPROPVARIANT value, and optionally a status result. When diagnosing MQ_ERROR_TOO_MANY_PROPERTIES, misaligned counts or reordered arrays can make the logged property differ from the one actually rejected.

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

Subsystem context

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	single call exceeds MSMQ property-count limit
Primary recovery rule	Split only logically independent reads; keep dependent property pairs together.

When diagnosing MQ_ERROR_TOO_MANY_PROPERTIES, 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_TOO_MANY_PROPERTIES, the code-specific boundary is single call exceeds MSMQ property-count limit.

Minimum useful telemetry

The api name and whether the structure was input, output, or both; associate it explicitly with MQ_ERROR_TOO_MANY_PROPERTIES.
When diagnosing MQ_ERROR_TOO_MANY_PROPERTIES, the first failing property rather than only the aggregate hresult; capture the value before cleanup or retry changes it.
In the MQ_ERROR_TOO_MANY_PROPERTIES path, the complete apropid/apropvar/astatus triples in original order; compare it with a known-good call using the same account and queue type.
For this MQ_ERROR_TOO_MANY_PROPERTIES 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_TOO_MANY_PROPERTIES, 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.

Step-by-step diagnosis

Record the unsigned HRESULT, MQ_ERROR_TOO_MANY_PROPERTIES, 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_TOO_MANY_PROPERTIES; change one precondition at a time.
In the MQ_ERROR_TOO_MANY_PROPERTIES 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_TOO_MANY_PROPERTIES result, capture the first failing property rather than only the aggregate HRESULT.
For MQ_ERROR_TOO_MANY_PROPERTIES, capture the complete aPropID/aPropVar/aStatus triples in original order.
When diagnosing MQ_ERROR_TOO_MANY_PROPERTIES, apply the code-specific recovery rule: Split only logically independent reads; keep dependent property pairs together.

Retry and cleanup

Split only logically independent reads; keep dependent property pairs together.

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

Avoiding a false diagnosis

In the MQ_ERROR_TOO_MANY_PROPERTIES 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_TOO_MANY_PROPERTIES remains single call exceeds MSMQ property-count limit.

In the MQ_ERROR_TOO_MANY_PROPERTIES path, 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.
For this MQ_ERROR_TOO_MANY_PROPERTIES result, restarting MSMQ before collecting evidence can invalidate handles and erase the first useful event; it is a containment action, not a root-cause diagnosis.

Example

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

For MQ_ERROR_TOO_MANY_PROPERTIES, include a negative test for the nearest misleading diagnosis so monitoring and user guidance do not collapse distinct MSMQ failures into one alert.

References

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

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