What does HRESULT 0xC00E0082 (MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX) mean?

MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX

Operational meaning

Applications should keep MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX attached to the exact MSMQ call that produced it; translating it immediately to “queue error” discards the diagnostic boundary. Its diagnostic boundary is received MSMQ 2.0 signature is invalid. Possible causes include message alteration, wrong certificate/key association, unsupported provider data, or malformed signature fields.

For MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX, encryption capability and message authentication are related but distinct. When diagnosing MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX, preserve provider, algorithm, certificate, key-container, and queue authentication/privacy settings rather than collapsing them into one “SSL” diagnosis.

When diagnosing MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX, authenticated MSMQ messages combine a sender identity, certificate, private key, hash/signature algorithm, and queue policy. In the MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX path, successful certificate parsing does not prove that the key is accessible to the sending process.

Where to draw the boundary

When diagnosing MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX, queue ACLs, certificate trust, private-key access, provider support, and destination authentication policy are independent. Test the layer named by the evidence. For MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX, the code-specific boundary is received MSMQ 2.0 signature is invalid.

Evidence to preserve

• Certificate store location and security identity used by the process; associate it explicitly with MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX.
• When diagnosing MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX, provider name/type, hash algorithm, and privacy/authentication properties; capture the value before cleanup or retry changes it.
• In the MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX path, whether the failure occurred while preparing, sending, storing, or validating the message; compare it with a known-good call using the same account and queue type.
• For this MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX 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_FAIL_VERIFY_SIGNATURE_EX, 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_FAIL_VERIFY_SIGNATURE_EX, and the native API or COM method before a framework replaces it with a generic exception.
2. Reproduce with the smallest queue/message/property set that still returns MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX; change one precondition at a time.
3. In the MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX path, verify the postcondition after the failed call: queue existence, message presence, directory object state, transaction outcome, or generated output may differ by result.
4. For this MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX result, capture certificate store location and security identity used by the process.
5. For MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX, capture provider name/type, hash algorithm, and privacy/authentication properties.
6. When diagnosing MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX, apply the code-specific recovery rule: Quarantine the message and compare sender certificate registration before any replay.

Handling and recovery

Quarantine the message and compare sender certificate registration before any replay.

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

Nearby failure boundaries

In the MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX path, authentication failure is not synonymous with queue access denial. For this MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX result, certificate stores, private keys, providers, signatures, and queue policy must be tested separately. The specific focus for MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX remains received MSMQ 2.0 signature is invalid.

• In the MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX 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_FAIL_VERIFY_SIGNATURE_EX result, granting broad queue or certificate permissions may mask the symptom while creating a security defect. For MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX, test the exact identity and access needed by the operation.

Worked example

A service sending authenticated messages encounters MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX. For MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX, it tests store and private-key access under the production identity before changing queue security. When diagnosing MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX, the acceptance test then changes only the decisive precondition and confirms both the HRESULT and the actual queue/message state.

Automated coverage should preserve the original arrays/identities, confirm that cleanup is safe after MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX, and test that a retry does not duplicate messages or directory objects.

References

• Microsoft: Windows certificate stores — source used for the MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX analysis.
• IETF RFC 5280: Internet X.509 PKI certificate profile — source used for the MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX analysis.
• Microsoft: Message Queuing error and information codes — source used for the MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX analysis.
• Microsoft: authenticated MSMQ message with an external certificate — source used for the MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX analysis.
• Microsoft: MSMQMessage object and message properties — source used for the MQ_ERROR_FAIL_VERIFY_SIGNATURE_EX analysis.

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