fix your setings 'installserver=localhost' ; <<--- the server for install need a name -fqnd 'mirrorhost=http://mirror.espri.arizona.edu/debian-amd64/' in /etc/fai/fai.conf and FAI_DEBOOTSTRAP="sarge http://http://mirror.espri.arizona.edu/debian-amd64/debian-amd64/" in /etc/fai/make-fai-nfsroot.conf