I am trying to setup OS authentication for oracle 8i on Windows NT. I created the two groups ora_dba and ora_oper and add my NT username to both. Remote_login_passwordfile is set to none and sqlnet.authentication_services =(NTS) was also setup in the sqlnet.ora file . However, whenever I try to logon using connect / as sysdba or connect / as sysoper The error message "Insufficient privileges" is generated. How can I correct this ?