2017 macbook pro with touchbar won't netboot. We only have two in the district as of right now and this is the first time I've had to try to reinstall the OS. When using internet recovery over a wire it claims 9+ hours and then errors out. I created a new netinstall using system image utility and it's being served from server 10.9.5 that holds our other netboot/netinstall images. I created a 10.12 netboot as well and it won't boot to either of them. Both were created using an installer from the app store on another mac with the same config assuming that would rule out any os build issues. (note my machine is high sierra, when I created the netboot/netinstall images I was running 10.12.6 but the specs in the picture are the same.)
Check the permissions on your NetInstall/NetBoot image. I have come to realize that the permissions are often too restrictive to enable machines to boot properly (700; improper owner/group). Verifying permissions are set properly, and that the proper user has access should fix your issue. Try setting permissions to 755 on the NBI folder, and owner/group to root:admin.