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RPC_NT_UNKNOWN_AUTHN_LEVEL
RPC does not recognize the authentication level
Authentication level controls how much protection is applied to a call, such as connect, packet integrity, or packet privacy. This status means the value is not a valid RPC-supported level.
A common diagnostic trap is mixing authentication service constants with authentication level constants. Confirm the parameter position and generated wrapper code.
What to inspect
- Log the authentication level value passed to the RPC security API.
- Use only documented RPC_C_AUTHN_LEVEL_* values.
- Check wrapper code that maps application policy to RPC constants.
References
- Microsoft: RpcBindingSetAuthInfoEx
- Microsoft Open Specifications: MS-RPCE
- Microsoft Open Specifications: NTSTATUS values
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