problem creating login in the visual administrator

Hii guyz,

Im working on a test system with netweaver 2004s installed on the system. I am trying to create login user for the visual administrator (other than default user) using the option

Direct connection to dispatcher node and gave the following options

username: j2ee_admin

Host: hostname of my machine

port:8101

Transport layer:Default.

But after hitting the connect button its saying " Cannot open connection on host:12.168.1.7 and port:8101

Plzz suggest me