Hi kuya....the installer actually pre-sets SQLNET.ORA with the
value SQLNET.AUTHENTICATION_SERVICES= (NTS) , so i did not change
any settings here. I just forgot the SYS password so i tried
connect to "/ as sysdba" and found out its not working.

We have also another test server with similar set-up (same OS and DB)
and it is working fine. I did not set any ORA_DBA group here and im
using Administrator OS account also when i install oracle.

Ill try to ask our SYSTEMS ADMINISTRATOR if he had set any ORA_DBA group in the prod server.


Thanks again.