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EPT_NT_NOT_REGISTERED
Requested RPC endpoint is not registered
EPT_NT_NOT_REGISTERED is the endpoint-mapper path for a lookup or unregister operation that cannot find a matching registration. In MS-RPCE terms, the endpoint mapper maps an interface/object UUID pair to a local dynamic endpoint.
For diagnostics, separate endpoint-map discovery from the actual remote procedure call. The server may be installed and reachable while its interface was never registered, registered under a different UUID/version, or registered only for another protocol sequence.
What to check
- Confirm that the server registered the interface and endpoint after startup, not only that the service process is running.
- Verify interface UUID, version, object UUID filter, network address, and protocol sequence used by the client lookup.
- Check for stale cached endpoint information after a service restart or dynamic endpoint change.
References
- Microsoft Open Specifications: MS-RPCE glossary
- Microsoft RPC: RPC return values
- Microsoft RPC: types of binding handles
- Microsoft Open Specifications: MS-RPCE overview
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