ACE Threat Modeling

I am a Chinese student and I am glad that you had goodtimes in my country.At this time my bussiness is about RPC authentocation, I knew that rpc without authetication cant work well due to the restriction in winxpsp2, and I added some fonctions in my code:
client RpcBindingSetAuthInfo(Handle,
"localhost",
RPC_C_AUTHN_LEVEL_DEFAULT,
RPC_C_AUTHN_WINNT,
&AuthIdentity,
RPC_C_AUTHN_WINNT)
server RpcServerRegisterAuthInfo("localhost",
RPC_C_AUTHN_WINNT,
NULL,
NULL).
And the function does work without changing the registerkey or the groupedit in sp2, and now the new demand is coming that the SSP "RPC_C_AUTHN_WINNT" in these functions have to change to "RPC_C_AUTHN_GSS_KERBEROS" to improve the security level, but the new codes always make a exception of "1747" wich refers to the Unknown authen service, have you ever met this? my eamil is zengxudong20@yahoo.com.cn,I am waitting for your callback,thank you.

ACE Threat Modeling
[Via: Keith Brown ]
AJAX Myth - I love it............. [Via: Wallym ]
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