Ok, I'm stumped and after having worked on this for the better part of a day, I'm ready to admit that I need help.
My Sonos Connect has two Ethernet ports. I have one connected to my router and the other is connected to my receiver. Using iPad apps, I can play music just fine using Yamaha's app Amazon Prime's app or Pandora's app using AirPlay. I'm trying to connect my Sonos Connect to my receiver (a Yamaha RX-A730). If I use a fiber optic cable, I can connect just fine. But to use the Yamaha's auto On feature, I have to connect via Ethernet. I have gone into the Yamaha's settings and specified the input as Server: Sonos.
Everyone's app except Sonos's seems to work just fine in this configuration.
Any suggestions will be gratefully appreciated.