Yes Rajeev, I connect from svrmgrl with this command.
connect sys/password as sysdba.

Then it's asked me the password, I typed the same sys password and it's connected but if i typed some thing also it's connecting. I don't know whether it's asking me the sysdba password or sys password. Anyway i gave the
startup mount but i got the same message.
ora 01031 insufficient privileges;