What does Windows error code 1746 (RPC_S_BINDING_HAS_NO_AUTH) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The binding does not contain any authentication information.

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RPC_S_PROCNUM_OUT_OF_RANGE	RPC_S_UNKNOWN_AUTHN_SERVICE

RPC_S_BINDING_HAS_NO_AUTH

RPC_S_BINDING_HAS_NO_AUTH means that the RPC binding handle has no authentication information. A client is not required to configure authentication for every binding, but an operation that requires it cannot use an unauthenticated binding.

What to check

Call RpcBindingSetAuthInfo on the binding before invoking a procedure that requires authenticated RPC.
Confirm the server accepts the selected authentication service and level.
Do not treat transport reachability as authentication; a successful connection can still be rejected because the binding has no credentials.

Microsoft: RpcBindingSetAuthInfo · RPC Return Values

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