Wired ethernet won't work

Bought my son a new XB1 for Christmas last year. Set it up initally on wireless and it was fine. Sometime a few months later I decided to go wired to try and cure a lag issue on some games. Unplug ethernet cord from my PS4, plug it into the XB1 sitting
next to it and the XB1 won't recognize the cable. Every once in a while it will act like it sees the cable for a few seconds then it disappears and says I need to plug in a cable. Gave up and went back to wireless.

Fast forward to 3 days ago and I decided to try it again...still doesn't work. My PS4 is flawless on that exact same cable. Plug my laptop into the cable and it connects right away. Plug it into the XB1 and it's like it doesn't exist.

Moved the ethernet cable from upstairs that is used for our XB360....plug it into the XB1 and I get nothing.

Tried a 3rd cord....nothing.

Hard reset of the console...no help.

Spent a couple of hours on chat with Microsoft support and after repeating all the tests I had already done they decided my ethernet port in the XB1 must be bad. Sent me an exchange unit since I was under warranty, got it today. Plug it into the ethernet
without setting up the wifi, it starts to download the console update so I'm thinking we are good. Update gets to about 28% and hangs up. Start over...same thing. 3rd time...same thing. Set up the wifi and the update download and installs no problem.

Delete my wifi and try the cord again...nothing.

So 2 XB1 consoles, 3 different ethernet cords, and none of it will connect. I can only get on using wifi which is ok, but I really want to try and clear up my lag issues on BF1.

Please tell me there is something I'm missing.

By the way I'm on Comcast, and have a router in a networking closet in my house. That closet is hardwired to plugs in several rooms in my house, so I plug the console cord into a wall jack that is wired to my router. Works fine for every device I try in
it except the XB1.

Help!!!

:)

 

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