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RPC_NT_UNKNOWN_AUTHZ_SERVICE
The authorization service is not recognized for this RPC binding
Authorization service is distinct from authentication service. This status means the supplied AuthzSvc value is not understood by the RPC runtime or the selected security configuration.
Because some authentication services ignore the authorization service parameter, diagnose the full security tuple rather than only the failing value.
What to inspect
- Log AuthnSvc, AuthnLevel, AuthzSvc and server principal name together.
- Confirm the service supports the selected authorization model.
- Check for constants placed in the wrong RpcBindingSetAuthInfo parameter.
References
- Microsoft: RpcBindingSetAuthInfoEx
- Microsoft Open Specifications: MS-RPCE
- Microsoft Open Specifications: NTSTATUS values
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