Hi @george1421! Thank you for your answer 
Well, I think the very same, so not sure if I should repeat the whole process (including FOG initial deployment/install), but sure, this wouldn’t seem a SecureBoot problem if it weren’t because of this setting in the firmware

I can see your firmware hasn’t that Secure Boot submenu, so … not sure how this could be interfering … but I’m having this issue when I set this in Deployed Mode. However, Audit Mode works as I expect, and … according to the description in my screenshot I’d say the proper value for production is Deployed Mode, and this should work in a very similar way Audit Mode does.
So not sure if this has something to do with some kind of network misconfiguration.
The most important fixes I’d suggest to your tutorial are the following, btw:
- You actually don’t need to
mv dbx.esl dbx-fog.esl as you are not generating any dbx.esl, you cannot even run that command successfully as dbx.esl file doesn’t exist 
- Also the param
chain tftp:/${fog-ip}/EnrollKeys.efi for fog.keyenroll should actually be chain tftp://${fog-ip}/EnrollKeys.efi
Aside this … the tutorial is so helpful so … congratulations @george1421
and thank you a lot for your answer again.