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RPC_S_ALREADY_LISTENING
RPC_S_ALREADY_LISTENING means that an RPC server attempted to enter its listening state when it was already listening. It normally points to duplicate server-start logic rather than a client connection problem.
Why it happens
The server may call RpcServerListen twice, run initialization concurrently, or reuse a component that starts the listener without coordinating with the host process.
What to do
- Make listener startup a one-time state transition owned by one component.
- Preserve and log the result of the first listen call, not just the later failure.
- For auto-listen interfaces, do not assume that an explicit call to
RpcServerListenis required.
Microsoft: RpcServerListen · RPC Return Values
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