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RPC_NT_UNKNOWN_AUTHN_TYPE
The authentication type is not recognized by RPC
This status is part of RPC security setup. The binding or call requested an authentication type that the RPC runtime does not recognize as a valid authentication service selection.
Check the difference between authentication type, authentication service, authentication level and authorization service. Mixing these constants can produce similar-looking setup failures.
What to inspect
- Log the numeric authentication type or service constant.
- Verify that the caller uses RPC_C_AUTHN_* constants in the correct parameter.
- Check whether the selected security package is installed and supported.
References
- Microsoft: RpcBindingSetAuthInfoEx
- Microsoft Open Specifications: MS-RPCE
- Microsoft Open Specifications: NTSTATUS values
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