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RPC_NT_ALREADY_LISTENING
RPC_NT_ALREADY_LISTENING is an NTSTATUS value used by the Windows RPC runtime. This status means the server runtime is already in a listening state when code attempts to start listening again. It is a server-lifecycle condition, not an indication that a client failed to connect or that an endpoint is malformed.
It differs from RPC_NT_NOT_LISTENING, which reports that a requested operation expects a listener that is not active. It also differs from RPC_NT_NO_PROTSEQS_REGISTERED, which means no protocol sequence was registered for the runtime to listen on.
The listener-start operation was repeated after the server entered listening state
- Trace calls that register protocol sequences, register interfaces and invoke the listen/start operation, including service-restart paths.
- Treat listener startup as stateful and protect it from duplicate initialization by independent components.
- Do not diagnose port conflicts from this status alone; the runtime has already reached a listening state.
References
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