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EVENT_S_NOSUBSCRIBERS
COM+ event published with no subscribers
EVENT_S_NOSUBSCRIBERS is HRESULT 262658 (0x00040202) from winerror.h. AllStat describes EVENT_S_NOSUBSCRIBERS as “An event was delivered but there were no subscribers.” The high-order severity bit is clear, so this is a success result, but it carries more information than plain S_OK.
The event publication path succeeded, but no active subscriber was registered to receive the event.
Where this result is encountered
EVENT_S_NOSUBSCRIBERScan appear in COM+ loosely coupled events; record the producing interface and method rather than inferring behavior from the symbolic name alone.EVENT_S_NOSUBSCRIBERScan appear in optional extension points; record the producing interface and method rather than inferring behavior from the symbolic name alone.EVENT_S_NOSUBSCRIBERScan appear in deployment states where subscriber applications are not installed or enabled; record the producing interface and method rather than inferring behavior from the symbolic name alone.
For EVENT_S_NOSUBSCRIBERS, the same numeric success value can be mishandled when a wrapper exposes only a Boolean. For EVENT_S_NOSUBSCRIBERS, keep the original HRESULT until the code-specific outputs and state transition have been evaluated.
State boundary that must be proved
The central question for EVENT_S_NOSUBSCRIBERS is whether the absence of subscribers is acceptable for this event or is detected as a deployment/configuration problem by the publisher. For EVENT_S_NOSUBSCRIBERS, the HRESULT alone confirms neither unrelated work nor the quality of optional outputs.
A reliable interpretation of EVENT_S_NOSUBSCRIBERS names the exact method contract, the object generation, and the outputs that remain valid. For EVENT_S_NOSUBSCRIBERS, this prevents a success-with-information result from being promoted to full success or demoted to a generic error.
Evidence and telemetry to preserve
- For
EVENT_S_NOSUBSCRIBERS, preserve event class and method. - For
EVENT_S_NOSUBSCRIBERS, preserve catalog subscription query. - For
EVENT_S_NOSUBSCRIBERS, preserve expected subscriber count. - For
EVENT_S_NOSUBSCRIBERS, preserve scope, identity, and partition context. - For
EVENT_S_NOSUBSCRIBERS, preserve publication timestamp and correlation ID.
Also record event_s_nosubscribers_operation, event_s_nosubscribers_object, event_s_nosubscribers_state_before, event_s_nosubscribers_state_after, UTC time, process and thread identifiers, and a correlation ID. For EVENT_S_NOSUBSCRIBERS, keep secrets out of logs while retaining GUIDs, CLSIDs, media subtypes, property IDs, row identities, and hashes needed to distinguish objects.
Correct handling, retry, and recovery
Treat the result as informational when subscribers are optional. Raise a configuration alert when the event represents a required workflow, but do not report transport failure.
Retry EVENT_S_NOSUBSCRIBERS only when the recorded state can change the documented outcome. For EVENT_S_NOSUBSCRIBERS, repeating the same call is inappropriate for a stable end marker, cancellation, unsupported format, adjusted property, or partial result whose completed side effects have not been reconciled.
Diagnostic sequence
- For
EVENT_S_NOSUBSCRIBERS, capture the raw HRESULT0x00040202immediately after the returning method and record whether the caller usedSUCCEEDED,FAILED, equality testing, or exception translation. - Identify the exact owner of
EVENT_S_NOSUBSCRIBERS: interface, method, object instance, provider or filter version, thread or apartment, and operation phase. - Validate the decisive contract boundary for
EVENT_S_NOSUBSCRIBERS: the absence of subscribers is acceptable for this event or is detected as a deployment/configuration problem by the publisher. - For
EVENT_S_NOSUBSCRIBERS, inspect every output parameter, count, status array, returned interface, or side effect that the method documentation associates with this success-with-information result. - Compare the observed state before and after
EVENT_S_NOSUBSCRIBERS; do not assume that a success severity bit means every optional sub-operation completed. - For
EVENT_S_NOSUBSCRIBERS, reproduce the smallest request with the same object state and then change only the condition identified by the evidence before repeating the operation.
Practical validation scenario
A plug-in notification is published on a workstation with no plug-ins installed. The publisher records EVENT_S_NOSUBSCRIBERS at debug level; an enterprise deployment test separately asserts that mandatory audit subscribers are present.
The negative test should preserve the condition that produces EVENT_S_NOSUBSCRIBERS; the recovery test should alter only that condition and verify the final state as well as the HRESULT.
Difference from nearby HRESULT values
EVENT_S_SOME_SUBSCRIBERS_FAILED means subscribers existed and delivery was mixed; EVENT_S_NOSUBSCRIBERS means there was nobody to invoke.
For EVENT_S_NOSUBSCRIBERS, this distinction determines whether the caller should consume partial outputs, stop iteration, wait, reconfigure, notify the user, or perform no error recovery at all.
Developer and administrator guidance
When EVENT_S_NOSUBSCRIBERS crosses process, RPC, scripting, or managed-code boundaries, preserve the unsigned 32-bit value and symbolic name. For EVENT_S_NOSUBSCRIBERS, a signed decimal rendering can obscure that the severity bit indicates success and can lead to incorrect exception or retry behavior.
A support report for EVENT_S_NOSUBSCRIBERS should include decimal 262658, hexadecimal 0x00040202, the AllStat meaning, the owning API, and the first detailed status or output that explains why the method did not return ordinary S_OK.
References
- Microsoft: COM event status codes — official documentation relevant to
EVENT_S_NOSUBSCRIBERS. - Microsoft: COM+ Events — official documentation relevant to
EVENT_S_NOSUBSCRIBERS. - Microsoft: HRESULT values — official documentation relevant to
EVENT_S_NOSUBSCRIBERS.
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