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COMQC_E_NO_QUEUEABLE_INTERFACES
For queued-interface metadata, the important question is not merely what the text says, but which contract was being evaluated. At this boundary, the queued component exposes no interface marked with the queueable attribute, so COM+ cannot record its method calls for deferred playback.
Where the failure sits
Queued Components cross several independent layers: call recording, MSMQ transport, message authentication, listener playback, and execution of the business method when diagnosing queued-interface metadata. Message ID, queue format name, original sender, any mover or requeuer, and the COM+ application version are the keys that join those layers without treating every queue symptom as the same fault for an incident involving queued-interface metadata.
Do not collapse this result into a nearby status. Application-level QueuingEnabled is necessary but not sufficient; at least one compatible interface must also be declared queueable. For queued-interface metadata, compare the lifecycle stage, object identity, caller context, and first returning API—not only the English wording or the final dialog shown to the user.
Facts to collect first
| Record | How it narrows the cause |
|---|---|
| Type library/IDL attributes for every exposed interface | Locates the exact attempt and prevents evidence from a later retry from being mixed into it when diagnosing queued-interface metadata. |
| CLSID and configured COM+ component version | Separates a contract or configuration defect from a transient environmental failure in an incident involving queued-interface metadata. |
| Method signatures, in/out parameters, return values, and unsupported interface types | Provides a stable comparison point for a controlled reproduction before changing the state involved in queued-interface metadata. |
| COM+ catalog state after reinstalling the component | Shows whether the proposed correction changes the first failing boundary during verification of queued-interface metadata. |
Collect the smallest evidence set that identifies the attempt and object when diagnosing queued-interface metadata. Redact secrets and message contents; preserve hashes, IDs, policy values, versions, and state transitions instead for an incident involving queued-interface metadata.
Change one variable at a time
- Inspect the registered type library rather than only source IDL; use a disposable or backed-up environment when the comparison changes boot, security, device, queue, or encryption state.
- Mark one test interface queueable and regenerate/re-register metadata; retain one negative control so that a broad workaround is not mistaken for a root-cause correction.
- Invoke the same component directly to separate interface metadata from implementation; keep every other input fixed and record the first event that differs from the failing run.
For queued-interface metadata, if the failure disappears after a broad restart, treat that as a clue about lifetime or state, not as proof of repair. Reproduce the original queued-interface metadata operation with targeted instrumentation before closing the incident.
What the result does not prove
Use the outcomes to narrow the layer rather than to accumulate unrelated fixes for queued-interface metadata:
| Observed result | Interpretation |
|---|---|
| The minimal or known-good comparison succeeds | For queued-interface metadata, the platform path is available; concentrate on the production object, arguments, identity, policy, or lifecycle state described above. |
| The control fails at the same first operation | For queued-interface metadata, failure of the control points below application-specific data; preserve service, provider, operating-system, or host evidence before changing the environment. |
| A different HRESULT appears after one controlled change | The queued-interface metadata boundary moved; diagnose the new status separately rather than treating it as confirmation that the entire operation is fixed. |
Verification after correction
The corrective action should be narrow: Design a one-way queueable interface with serializable input parameters and install the matching type library/catalog metadata. For queued-interface metadata, preserve the pre-change export or trace and document the exact configuration, build, identity, object, or policy that changed.
Close the incident only when the queue moniker exposes only approved queueable interfaces and direct-only interfaces cannot be recorded accidentally. For queued-interface metadata, repeat the original supported operation under the original identity and object state, then retain one deliberate boundary or negative test. A result from a different account, simplified input, replacement object, or unrelated machine is useful comparison data for queued-interface metadata, but it is not regression proof.
Technical references
Use these sources for the formal contract, then combine them with evidence from the returning application or service for queued-interface metadata:
- Microsoft: COM error codes.
- Microsoft: using the queue moniker.
- Microsoft: COM+ queued components tasks.
- Microsoft: Message Queuing.
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