My apple TV 4th Gen was working fine, connected to my access point via an ethernet cable up until today 13th Feb 2018. Now its not working. On the setting->network it shows the correct IP address, Subnet and subnet mask, all looks good, but no connection. It works via WIFI only!!
I have checked the same cable connection on my laptop and it works!!
I am on tvOS 11.2.5
Apple TV 4K, iOS 11.2.5
100% agree with BabakOnly and have replicated the issue.
I bought three 4K AppleTVs and their iOS version out of the box was 11.1. I configured the first AppleTV 4K how I wanted it, was attached to Ethernet just fine and as my last step, I ran the updater with took the AppleTV to 11.2.5. After that, it would ONLY see wifi. I confirmed the port was still active, still assigning an IP, etc. No other change was made other than the OS update. I reset this AppleTV, however it didn't revert to the 11.1 it shipped with, it still was at 11.2.5. With no USB ports, I don't see how I can get this device back to a stable version. Our wireless signal in our office is HORRIBLE and I must have it hardwired.
I put that AppleTV 4K aside and replaced it with a new boxed one with 11.1 installed. Again, when through same process of configuring it, same port used and it pulled from ethernet. I did NOT update this one to 11.2.5 and it's working fine via ethernet. I will be taking the one that's at 11.2.5 to a Apple Genius Bar to see if they can revert the software on it so I can hard wire it. If not, I'll have to do a return/repurchase to get a device that isn't at 11.2.5.
In short, 11.2.5 does break ethernet connectivity. If you need the hard wire, do NOT upgrade until Apple fixes.
While searching the internet about this issue, I saw this worked for many but not all.
In my situation, these 4K AppleTVs are used in a corporate environment. Can’t really reboot all the routers and switches throughout the building with users and servers plugin in! No real feasible time to do that!
If Mac computing devices can dynamically switch connections on the fly (wireless, Ethernet, vpn, etc) and update configuration settings (IP, gateway, DNS,, proxy server, etc), why would this be any different? The AppleTVs should dynamically switch as well!
I have this problem the only way I cure it is to reboot the router never happened on my old non 4K Apple TV box that was plugged in to the same Ethernet port.
Apple TV Ethernet connection not working
