@tom-elliott Interesting…enabling Secure Boot did in fact cause the computer to boot to the Windows OS. But it bypassed the FOG menu. It downloaded the NBP successfully, but then loaded Windows.
Disabling Secure Boot caused it to once again boot to the FOG menu, which then timed out, and then hit the rEFInd snag.
Is this model of hardware unable to boot to the FOG server, timeout, and then load Windows?
At this point, it seems it can do either Windows or FOG, but not both together.