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RPC_S_PROCNUM_OUT_OF_RANGE
RPC operation numbers come from the interface contract
RPC_S_PROCNUM_OUT_OF_RANGE means the server received or processed a procedure number that its registered interface does not define. In DCE/RPC terminology the operation number, often shown as opnum in protocol analysis, selects a procedure within an interface.
This is a strong sign of an interface-contract mismatch. The client can reach the server and may even bind to an interface UUID, but the call number does not exist in the server's dispatch table.
What to compare
- Capture the interface UUID, interface version, and opnum from the failed call.
- Compare the exact IDL/MIDL revision used to generate client and server stubs.
- Check whether a hand-written DCE/RPC client copied opnums from a different interface version or product release.
- Do not retry neighboring procedure numbers. Opnums are protocol contract values, not dynamic server slots.
If a packet capture shows a bind to one interface version followed by an opnum defined only in another version, align the interface definition and generated stubs.
References
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