I don't know how long it's been an issue since I never had to populate all 3 ports on my XE5300 pods until recently. 

When my computer is plugged into port 1, I get unrecognized network and a 169 ip. I tried updating my Deco and rebooting the Deco. I also tried to reboot my computer, release and renew ip but renewing fails. Windows network troubleshooter can't fix it.

As soon as I plug into port 2 or 3, it works. Tried with my other ethernet capaple devices and all fails with port 1.