Move the client powerline device to the same socket as the first powerline device to rule out an issue. If that works, that means something, if not I have to call it a PC issue but that's it. There's no PC detail here.
I am trying to connect to my Asus RT N66U using a TP Link AV1200 Powerline. I can connect my PC to the router fine over wifi, and the ethernet over the powerline is working fine for my android TV box (powerline status lights all look good too). But on my PC attempting to use the ethernet just gives 'No Network Access'. Does anyone know where I am going wrong?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic