nbd is used to boot, so if you have the login screen in front of oyu you dont 
have to care about dhcp, tftp or nbd anymore
did you follow the quickinstall guide from 
https://help.ubuntu.com/community/UbuntuLTSP/QuickInstall ?
is your ssh server up and running while you try to log in ?

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"This workstation is not authorized to connect to the server"
https://bugs.launchpad.net/bugs/151386
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