So i wen through and followed the new doc for configuring netboot you just released (Thank you for that by the way) and can now actually boot to netboot. The issue i an running into though is i get the spinning globe, which is normal. after a few seconds i get the progress bar as if the client is booting into netboot, but then it never actually boots to the NBI. The progress bar goes fast about half way then comes to a crawl...eventually the progress bar will even fill up but never go any further. This was tested using an iMac, Macbook Air and a 2010 white macbook. All have the same result. It almost seems like maybe it's having trouble uncompressing/mounting the NBI? The OS i used for the NBI is the latest build of El Cpitan, 10.11.5.