"Network adapter Error "
Whenever you try to access remote machine's port through the software
and you found "Network adapter Error" .
then it has port Issue
Open the port first .
Suppose, while installing the oracle you gave the port number as 1521 that is default port number
then if you found Network adapter error then
Try to open a port i.e 1521 through the firewall setting
Open all those port which ever you given for installation a particular software .
Refer my previous post :)