unable to detect device

i am trying to set up my portserver TS 4W to a desktop.i connect the way the guide told me to do.at the setup wizard,it cannot discover any devices even thought it was connected.is it because of the internet cable?please help me asap thanks

http://www.digi.com/support/kbase/kbaseresultdetl.jsp?id=1035
http://www.digi.com/support/kbase/kbaseresultdetl.jsp?id=963