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MQ_ERROR_ILLEGAL_CONTEXT
Why the exact HRESULT matters
Applications should keep MQ_ERROR_ILLEGAL_CONTEXT attached to the exact MSMQ call that produced it; translating it immediately to “queue error” discards the diagnostic boundary. Its diagnostic boundary is unsupported MQLocateBegin context parameter. The API requires the documented context form; legacy/non-null context data is rejected.
The locator observes a directory snapshot beginning when MQLocateBegin is called. When diagnosing this result, newly replicated objects and properties unsupported as columns or sort keys can produce results that differ from direct queue access.
When diagnosing this result, public-queue discovery depends on both valid MSMQ query structures and AD DS behavior., A malformed MQSORTSET should be separated from LDAP bind, schema, replication, or permissions failures.
Subsystem context
| Subsystem | MQLocateBegin directory queries over public-queue metadata |
|---|---|
| Decisive boundary | query restrictions, selected columns, and sort keys must be valid for the AD DS-backed locator |
| Code-specific focus | unsupported MQLocateBegin context parameter |
| Primary recovery rule | Pass the supported value and keep application paging state outside the MSMQ parameter. |
When diagnosing this result, separate a malformed query structure from an AD DS availability error., repeating the same invalid MQSORTSET or MQRESTRICTION against another domain controller will not repair it. The code-specific boundary is unsupported MQLocateBegin context parameter.
Minimum useful telemetry
- The exact property used for filtering, projection, or ordering; associate it explicitly with this result.
- When diagnosing it, mqrestriction, mqcolumns, and mqsortset as submitted; capture the value before cleanup or retry changes it.
- In the path, the ad ds mode and domain identity of the caller; compare it with a known-good call using the same account and queue 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
- Record the unsigned HRESULT, it, and the native API or COM method before a framework replaces it with a generic exception.
- When diagnosing it, capture the AD DS mode and domain identity of the caller.
- In the path, capture the exact property used for filtering, projection, or ordering.
- verify the postcondition after the failed call: queue existence, message presence, directory object state, transaction outcome, or generated output may differ by result.
- When diagnosing it, apply the code-specific recovery rule: Pass the supported value and keep application paging state outside the MSMQ parameter.
Retry and cleanup
Pass the supported value and keep application paging state outside the MSMQ parameter.
When diagnosing it, an immediate loop around the same call is not recovery., define who owns cancellation, handle recreation, transaction reconciliation, and duplicate suppression before another attempt is issued.
Avoiding a false diagnosis
A directory query shape error is deterministic. switching domain controllers cannot make an unsupported column, relation, or sort key valid. The specific focus for it remains unsupported MQLocateBegin context parameter.
- In the 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.
- 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 administration console encounters it. It captures the restriction/column/sort structures and validates the query before testing directory availability.
A regression test should force it, assert the raw value and relevant outputs, then correct only the documented precondition and verify the intended success or neighboring HRESULT.
References
- Microsoft: MQLocateBegin — source used for the result analysis.
- Microsoft Open Specifications: MSMQ and directory services — source used for the result analysis.
- IETF RFC 4511: LDAP protocol — source used for the result analysis.
- Microsoft: Message Queuing error and information codes — source used for the result analysis.
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