SOLUTION:
Thanks for your suggestions. I helped me isolate and troubleshoot the issue.

I found the root problem to the Dell installed NIC and my failure to not understand how to move the NIC card assignments in UT.

Once realized I had to save after moving NIC assignments (External to Internal, etc.), then I could better test the connections. I found the Dell NIC never connected. I added another Linksys NIC, then moved the Dell NIC to the DMZ, saved and everything started working.