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RPC_S_INVALID_RPC_PROTSEQ
RPC_S_INVALID_RPC_PROTSEQ means that the protocol-sequence value itself is invalid. This differs from RPC_S_PROTSEQ_NOT_SUPPORTED: here the runtime cannot accept the supplied value as a valid RPC protocol-sequence identifier.
Typical cause
The value was misspelled, truncated, configured with the wrong identifier, or supplied in a place where RPC expects another binding component. A syntactically valid host name or port number does not make a protocol-sequence field valid.
What to do
- Use the documented RPC protocol-sequence constants exactly.
- Validate configuration before calling the RPC binding APIs.
- Keep the protocol sequence, network address and endpoint as separate configuration values.
Microsoft: Selecting a Protocol Sequence · RPC Return Values
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