I finally got my PXE Menu to work as I wanted it, and now everytime I
attempt to boot into PXE mode, I receive

"BOOT.DNX: Image is not signed, aborting..."

I've even reverted back to the default TFTP folder that was installed with
ZENWorks and it says the same thing. I've failed the cluster over to the
secondary server assuming it was a server glitch and the same error.

What has happened?