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RPC_S_NO_MORE_MEMBERS
The RPC enumeration has reached the end of its member set.
RPC_S_NO_MORE_MEMBERS is Win32/RPC status 1757 (0x6DD). In documented RPC name-service enumeration APIs, this value is commonly an end-of-enumeration condition rather than a transport failure. For example, RpcNsEntryObjectInqNext returns it after every object UUID associated with an entry has been viewed. Callers should close the inquiry context and keep the items already collected.
Why applications mishandle this status
- generic error wrappers classify every nonzero RPC status as a failed request
- enumeration code expects a count in advance and treats an empty final call as data loss
- a loop retries the same inquiry after the terminal status instead of releasing it
- parallel consumers accidentally share one enumeration context and advance each other
- the application confuses “no more members” with “requested member not found”
What to record in telemetry
Log the RPC API, namespace entry or group being enumerated, inquiry context identifier, number of members already returned, filters, interface and object UUIDs, elapsed time, and whether cleanup succeeded. Normal completion should usually be an informational event or counter, not an error alert. Avoid logging binding credentials or sensitive namespace paths.
Correct interpretation sequence
Check the contract of the exact RPC function. If 1757 is documented as the terminal result, stop calling the “next” function, close the inquiry handle, and return the accumulated collection. An empty collection is valid when the first call reaches the terminal state.
If the status appears earlier than expected, verify that the context was initialized once, is not shared across threads, and was not already advanced by a helper. Compare server-side membership with the same filters and object type. Transport errors, endpoint mapper failures, and access denials must be handled separately because they indicate incomplete enumeration.
Implementation guidance
Represent enumeration completion explicitly in the wrapper API, for example as an iterator end or successful result with no next item. Always pair the begin operation with its corresponding done function, including exception paths. Do not retry 1757 with backoff unless a new inquiry is intentionally started because the underlying collection may have changed.
Tests should cover zero members, one member, multiple pages, cancellation, concurrent enumerations, and cleanup after a mid-stream RPC failure. This prevents terminal status from being reported as service degradation.
Difference from missing membership
RPC_S_GROUP_MEMBER_NOT_FOUND says a particular member was not found. RPC_S_NO_MORE_MEMBERS says sequential enumeration is finished. The first can reject a requested mutation; the second normally completes a read loop successfully.
Example
A discovery service reads object UUIDs from an RPC namespace entry. Three calls return UUIDs and the fourth returns 1757. The service keeps the three results, calls the inquiry cleanup routine, and marks the scan complete instead of opening an incident for an RPC outage.
References
- Microsoft: System Error Codes (1700–3999)
- Microsoft: RPC return values
- Microsoft: RpcNsEntryObjectInqNext
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