I have oracle 9i rel 2 on Windows XP sp 2. When i connect with sys user and password i can connect using the passoword file without any error, but when i try to connect using OS authentication method, i could not connect to oracle.

SQL> conn sys/santosh as sysdba
Connected.
SQL> conn / as sysdba
ERROR:
ORA-01031: insufficient privileges

Warning: You are no longer connected to ORACLE.

I have checked the ORA_DBA group, where OS user 'thapa' is already exists and my sqlnet file settings are as below

SQLNET.AUTHENTICATION_SERVICES= (NTS)

NAMES.DIRECTORY_PATH= (TNSNAMES, ONAMES, HOSTNAME)

I shall be thankful if you inform me the solution

Thanks in advance

Santosh Kumar
OCP 9i DBA
Chandigarh, India