hai...DBA,
 
i'm a newcomer for Oracle Enterprise Edition.
i used to learn Personal Edition 8.1.6 before.
 
now i'm facing a problem in Enterprise Edition 8.1.6 on Win2000 Advance Server.
It worked fine before then suddenly, when i attempt to login,
no matter it's SQLPlus, EMS, DBA Studio,....
it's just returned this error message:
    ORA-12638 Credential retrieval failed
so i can't login and can't start the oracle.
 
i referred to Oracle error code description,
it say,
    Cause: The authentication service failed to retrieve
            credentials of a user.
    Action: Enable tracing to determine the exact error.
 
so, what should i do? enable tracing for what? Listener?
 
 
thanks and hav a nice day.

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