DHCP on both Wifi and LAN ports?

Everything works well; Wifi clients (MAC only), AppleTV, USB Hub with Printer and 3 External disks etc...
I plug in my MacPro via a LAN Cable and it does not get a valid IP Address from the DHCP server.
Tried setting a fixed IP with all the proper config, nothing gives.
I am a tried and true IT professional with over 20 years, and can't figure this one out. Anyone else have this problem?

That certainly should work. The AirPort Extreme base station (AEBS) supports both wired clients (via the LAN ports) and wireless clients. All clients appear on the same subnet.
The MacPro has 2 Ethernet ports? Have you tried both of them? Check the Network preference pane to ensure that the one you are using is enabled.
Otherwise... have you tried using one of the other LAN ports? Have you tried a different Ethernet cable to eliminate the possibility of a defective cable?

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