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RPC_NT_PROTSEQ_NOT_FOUND
The protocol sequence was not registered or is unavailable
An RPC protocol sequence selects the transport family, such as TCP, named pipes, local RPC, or HTTP. This status means the runtime cannot find the requested protocol sequence for the binding or server registration.
Diagnose the protocol sequence string and platform support. The endpoint name alone is not enough; the same endpoint text can mean different things under different protocol sequences.
What to inspect
- Verify the protocol sequence spelling and availability.
- Check service startup paths that call RpcServerUseProtseq or related APIs.
- Confirm firewall and transport setup only after the protocol sequence is valid.
References
- Microsoft: Specifying RPC endpoints
- Microsoft Open Specifications: MS-RPCE
- Microsoft Open Specifications: NTSTATUS values
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