I have the 2015 retina MBP with all updates. I can normally connect my Apple ethernet adapter to the lightning port and connecting a cable to my AEBS, My CenturyLink DSL service went down Friday and they are coming to fix it tomorrow. I think I'll cancel it after this month though. I got tired of waiting and got Comcast internet activated last night. I still had my old modem from a few years ago and connected it and all is well. When I try and connect the cable from the Comcast modem to my MBP using the ethernet to thunderbolt adapter, in the network settings, i turns yellow and says self assigned IP and so the internet never connects. My Comcast modem also fails to work correctly with AEBS. The AEBS is seriously old, from 2008 so I have a feeling that buying a new model will work. None of the settings I have found online from others who had the same problem have worked. Anyone how how I can fix this? I mainly care about the thunderbolt problem now. I can always call Apple and get support since I am still within my 90 days. I should also point out that the modem connects correctly through ethernet on my 2012 MBP.