Possible explaination....

I had similar behavior when I upgraded a client with a single server to a
newer/faster machine.  I initially cloned the original disk to the new
server and let 'plug and play' do its thing with the differences in
hardware.  This included a new network card (among other things).  All
went well except the authorization of the DHCP server at its previous
settings.  I did many of the things you did, deleting the old scope, even
uninstalling DHCP altogether and re-installing.

It didn't work again until I modified the original IP from 192.168.100.254
to x.x.x.253.  My thoughts at the time were that the original DHCP
installation 'registered' more than just the host's IP info into the AD
but also info relating to the NIC (possibly the unique MAC address).  I
also guessed that I couldn't properly remove the previous settings once
that card was not part of the system.  I suspect that in the process of
your Re-Creation of your server to a DC that something in the AD still
thought of your DHCP server's IP with a different NIC was still registered
within its guts somewhere.

So I agree with others, in hindsight we might guess, but no one can tell
us what the problem is.  Just go with what works and get on with the next
issue.  Be Pragmatic!

Good luck.
drew sweeney

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