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MQ_ERROR_INVALID_CERTIFICATE
Operational meaning
MQ_ERROR_INVALID_CERTIFICATE belongs to the Message Queuing HRESULT facility, but its useful meaning is narrower than a generic messaging failure. In this case the relevant subject is certificate unusable by MSMQ authentication. Check DER encoding, private-key availability where needed, store placement, registration, and the security identity opening the store.
Encryption capability and message authentication are related but distinct. When diagnosing this result, preserve provider, algorithm, certificate, key-container, and queue authentication/privacy settings rather than collapsing them into one “SSL” diagnosis.
Authenticated MSMQ messages combine a sender identity, certificate, private key, hash/signature algorithm, and queue policy. Successful certificate parsing does not prove that the key is accessible to the sending process.
Where the condition occurs
| Subsystem | MSMQ message authentication, certificate registration, signing, hashing, and encryption |
|---|---|
| Relevant condition | certificate identity, key availability, provider capability, and message policy are independent checks |
| Code-specific focus | certificate unusable by MSMQ authentication |
Queue ACLs, certificate trust, private-key access, provider support, and destination authentication policy are independent. Test the layer named by the evidence. The code-specific boundary is certificate unusable by MSMQ authentication.
Evidence to preserve
- Whether the failure occurred while preparing, sending, storing, or validating the message.
- Certificate store location and security identity used by the process.
- Provider name/type, hash algorithm, and privacy/authentication properties.
Handling and recovery
Replacing trust roots alone will not repair a malformed or inaccessible sender certificate.
Nearby failures
Authentication failure is not synonymous with queue access denial. Certificate stores, private keys, providers, signatures, and queue policy must be tested separately. Code-specific condition: certificate unusable by MSMQ authentication.
Worked example
A secure connector encounters it. It tests store and private-key access under the production identity before changing queue security.
References
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