Hello Shahan,
in this case it is enough to enter the login/no_automatic_user_sapstar = 0 profile parameter into one of the application server profiles, then log on to this application server.
Don't forget to restart the entire system before you try to use this parameter.
Also: perhaps this Discussion should be moved to e.g. http://scn.sap.com/community/netweaver-as, as this Space is not exactly meant for specific questions like this...
Best regards,
Laszlo