I did all required after reading from manula.
For setting up OS Authentication on NT :-
Shutdown the instance
set remote_login_passwordfile = NONE
created an NT group on srver where oracle is installes named as
ORA_DBA. Added 1 NT user as member of that group.
DID CONNECT / AS SYSDBA and got this error
ORA-01031 : insufficient privileges
What else is required.
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