Update: I get a similar /var/log/live/config.log when I try pxebooting with the kernel cmdline below. Again: after networking gets initialized outside live-config and directly from init, wgetting the hook works. boot=live fetch=http://1.2.3.4/downloads/kvm/linux_debian-live-7.0.0-amd64-rescue/live/filesystem.squashfs live-config live-config.hooks=http://1.2.3.4/downloads/kvm/live-hook-wheezy debug=y live-config.debug