Can't share via wifi on apple tv
I have just brought Apple TV, connect it up and updated via wifi. I am trying to share with iTunes on a windows xp pc, but will not work. So plugged an Ethernet lead into my hub & it works. So why on the same network but via wifi does it not work? Also my iPad 2 & iPhone 4s (both with IOS 5) do not show the airplay mirror button.
Apple TV, iOS 5.0.1