CoRegisterAuthenticationService

HRESULT CoRegisterAuthenticationServices(cbauthSvc, asAuthSvc);

This API sets the list of authentication services COM will use to authenticate incoming calls. If a call arrives with a different authentication service, the call will fail. Registering authentication services does not prevent the arrival of unsecure calls (for example, calls with no authentication service). This API can only be called before any interfaces are marshaled. Thus servers must call this if they want security. This call is not useful for clients (unless they are also servers).

This API can only be called once.

An application cannot call both CoInitializeSecurity and CoRegisterAuthenticationService.

Argument	Type	Description
cbAuthSvc	DWORD	Specify the number of authentication services in the list asAuthSvc.
asAuthSvc	SOLE_AUTHENTICATION _SERVICE*	An array of authentication services to register. The authentication services are enumerated in rpcdce.h. COM copies the list. If the principal name is NULL, COM will assume the current user ID. A NULL principal name will work for NTLMSSP and Kerberos. It may or may not work for other authentication services.
Returns	S_OK	Success.
	E_INVALIDARG	One or more arguments are invalid.