ATV4 not connecting via ethernet

Did you manually change any of the settings like the DNS Server? That is all I can think of.

 

What's the other end of the cable going to?

Is it possible a cable got knocked out closer to your main router?
Is it possible the port on the main router (or a switch in the middle) is configured differently?

Also have you tried another ethernet cable?

 

I use AUTOMATIC.

In Setings / Network - look at all of your IP Address's. Except for the one titled "IP Address" where the last part is probably different the rest should be the same for both Ethernet and WiFi.

 

just a note from various forums
it will work better using wifi for some reason.

 

I had this same problem on two ATV4's. What I discovered after a lot of research is that my router does not read the full MAC address. If you loose connectivity with your wired connection, the ATV senses this and connects wireless. This adds the second MAC address which because the router does not use the entire address looks like a duplicate. The solution was to go into the router and delete both MAC addresses and try to connect wired, and it will insert the MAC address for that connection. Every time you loose your wired connection, you will have to repeat the process to delete the MAC addresses. All my neighbors who have ATV4's have the same problem, which I fixed the same way. I use Century Link Prism for my internet.