What does HRESULT 0xC00E0055 (MQ_ERROR_MISSING_CONNECTOR_TYPE) mean?

MQ_ERROR_MISSING_CONNECTOR_TYPE

Why the exact HRESULT matters

Applications should keep MQ_ERROR_MISSING_CONNECTOR_TYPE attached to the exact MSMQ call that produced it; translating it immediately to “queue error” discards the diagnostic boundary. Interpret it as application supplied connector-owned message fields without connector identity, not as a general transport outage. MSMQ needs PROPID_M_CONNECTOR_TYPE to interpret system properties generated by a connector or application-encrypted message.

For MQ_ERROR_MISSING_CONNECTOR_TYPE, log the destination format-name form and connector identity while avoiding credentials and message payloads. When diagnosing MQ_ERROR_MISSING_CONNECTOR_TYPE, this separates local serialization errors from foreign-system rejection.

When diagnosing MQ_ERROR_MISSING_CONNECTOR_TYPE, connector applications may supply fields that MSMQ normally generates. In the MQ_ERROR_MISSING_CONNECTOR_TYPE path, the connector type GUID tells MSMQ which foreign-system semantics own those fields and how acknowledgments or security data should be interpreted.

Subsystem context

When diagnosing MQ_ERROR_MISSING_CONNECTOR_TYPE, native MSMQ semantics do not guarantee that a foreign queue supports the same operation, acknowledgment, authentication, or generated-property rules. For MQ_ERROR_MISSING_CONNECTOR_TYPE, the code-specific boundary is application supplied connector-owned message fields without connector identity.

Minimum useful telemetry

• Destination format-name type and foreign-system connector configuration; associate it explicitly with MQ_ERROR_MISSING_CONNECTOR_TYPE.
• When diagnosing MQ_ERROR_MISSING_CONNECTOR_TYPE, whether msmq or the connector is expected to generate each field; capture the value before cleanup or retry changes it.
• In the MQ_ERROR_MISSING_CONNECTOR_TYPE path, propid_m_connector_type and all application-supplied system properties; compare it with a known-good call using the same account and queue type.
• For this MQ_ERROR_MISSING_CONNECTOR_TYPE 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_MISSING_CONNECTOR_TYPE, 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

1. Record the unsigned HRESULT, MQ_ERROR_MISSING_CONNECTOR_TYPE, and the native API or COM method before a framework replaces it with a generic exception.
2. When diagnosing MQ_ERROR_MISSING_CONNECTOR_TYPE, verify the postcondition after the failed call: queue existence, message presence, directory object state, transaction outcome, or generated output may differ by result.
3. In the MQ_ERROR_MISSING_CONNECTOR_TYPE path, capture destination format-name type and foreign-system connector configuration.
4. For this MQ_ERROR_MISSING_CONNECTOR_TYPE result, capture whether MSMQ or the connector is expected to generate each field.
5. Reproduce with the smallest queue/message/property set that still returns MQ_ERROR_MISSING_CONNECTOR_TYPE; change one precondition at a time.
6. When diagnosing MQ_ERROR_MISSING_CONNECTOR_TYPE, apply the code-specific recovery rule: Set the connector GUID consistently or let MSMQ generate the system properties.

Retry and cleanup

Set the connector GUID consistently or let MSMQ generate the system properties.

When diagnosing MQ_ERROR_MISSING_CONNECTOR_TYPE, retry only after a measurable state change: corrected property data, resized storage, restored service/directory reachability, recreated handle, completed transaction recovery, or repaired certificate access. In the MQ_ERROR_MISSING_CONNECTOR_TYPE path, bound attempts and keep an idempotency key for sends or directory mutations.

Avoiding a false diagnosis

In the MQ_ERROR_MISSING_CONNECTOR_TYPE path, A locally valid MSMQ action can still be outside the capability model of the connector or foreign queuing system. The specific focus for MQ_ERROR_MISSING_CONNECTOR_TYPE remains application supplied connector-owned message fields without connector identity.

• In the MQ_ERROR_MISSING_CONNECTOR_TYPE 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_MISSING_CONNECTOR_TYPE 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

An acknowledgment gateway encounters MQ_ERROR_MISSING_CONNECTOR_TYPE. For MQ_ERROR_MISSING_CONNECTOR_TYPE, it verifies the connector GUID and foreign-system capability before resubmitting the message. When diagnosing MQ_ERROR_MISSING_CONNECTOR_TYPE, the acceptance test then changes only the decisive precondition and confirms both the HRESULT and the actual queue/message state.

For MQ_ERROR_MISSING_CONNECTOR_TYPE, 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: Message Queuing error and information codes — source used for the MQ_ERROR_MISSING_CONNECTOR_TYPE analysis.
• Microsoft: MSMQMessage object and message properties — source used for the MQ_ERROR_MISSING_CONNECTOR_TYPE analysis.
• Microsoft: MQSendMessage — source used for the MQ_ERROR_MISSING_CONNECTOR_TYPE analysis.
• Microsoft Open Specifications: MSMQ protocols overview — source used for the MQ_ERROR_MISSING_CONNECTOR_TYPE analysis.

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