What does HRESULT 0xC00E0069 (MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE) mean?

MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE

Operational meaning

MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE belongs to the Message Queuing HRESULT facility, but its useful meaning is narrower than a generic messaging failure. In this case the decisive subject is remote computer cannot service read/cursor operation. Name resolution may succeed while the remote queue manager or RPC path is unavailable.

For MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, the queue name, resolved address, MSMQ service, firewall path, protocol version, and requested operation are separate checkpoints. When diagnosing MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, A ping or DNS success alone does not prove remote-read support.

When diagnosing MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, older MSMQ versions do not implement every lookup-ID or management operation. In the MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE path, capture the peer version and use a fallback only when its ordering and delivery semantics are acceptable.

Where to draw the boundary

When diagnosing MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, differentiate remote-read RPC from ordinary send-and-forward delivery. In the MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE path, opening or peeking a remote queue can fail even when outgoing messages eventually reach it. For MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, the code-specific boundary is remote computer cannot service read/cursor operation.

Evidence to preserve

• Destination computer and resolved address or format name; associate it explicitly with MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE.
• When diagnosing MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, msmq service state and protocol reachability on both systems; capture the value before cleanup or retry changes it.
• In the MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE path, remote msmq version and the exact operation requested; compare it with a known-good call using the same account and queue type.
• For this MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE 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_REMOTE_MACHINE_NOT_AVAILABLE, 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.

Diagnostic sequence

1. Record the unsigned HRESULT, MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, and the native API or COM method before a framework replaces it with a generic exception.
2. When diagnosing MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, capture remote MSMQ version and the exact operation requested.
3. Reproduce with the smallest queue/message/property set that still returns MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE; change one precondition at a time.
4. For this MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE result, verify the postcondition after the failed call: queue existence, message presence, directory object state, transaction outcome, or generated output may differ by result.
5. For MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, capture MSMQ service state and protocol reachability on both systems.
6. When diagnosing MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, apply the code-specific recovery rule: Verify remote MSMQ service and network path before opening a new handle.

Handling and recovery

Verify remote MSMQ service and network path before opening a new handle.

When diagnosing MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, an immediate loop around the same call is not recovery. In the MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE path, define who owns cancellation, handle recreation, transaction reconciliation, and duplicate suppression before another attempt is issued.

Nearby failure boundaries

In the MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE path, DNS success and an open TCP path are not proof that the remote MSMQ version supports the requested read, cursor, or management operation. The specific focus for MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE remains remote computer cannot service read/cursor operation.

• In the MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE path, restarting MSMQ before collecting evidence can invalidate handles and erase the first useful event; it is a containment action, not a root-cause diagnosis.
• For this MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE result, granting broad queue or certificate permissions may mask the symptom while creating a security defect. For MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, test the exact identity and access needed by the operation.

Worked example

A remote queue monitor encounters MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE. For MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, it separates DNS, service/RPC reachability, remote version, and the specific remote-read operation. When diagnosing MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, the acceptance test then changes only the decisive precondition and confirms both the HRESULT and the actual queue/message state.

For MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE, 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_REMOTE_MACHINE_NOT_AVAILABLE analysis.
• Microsoft Open Specifications: Queue Manager Remote Read Protocol — source used for the MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE analysis.
• Microsoft Open Specifications: MSMQ protocols overview — source used for the MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE analysis.
• Microsoft: Windows service port requirements — source used for the MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE analysis.
• Microsoft: destination queues — source used for the MQ_ERROR_REMOTE_MACHINE_NOT_AVAILABLE analysis.

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