On your Mac, open “System Preferences.” Click on the “Wi-Fi” tab. IF you have an older interface: In the lower-left corner of the System Preferences window, click on the network status icon. On a newer interface: In the lower right corner of the System Preferences window, click on the Wi-Fi switch knob. Make sure that both your Apple TV and iOS are unconnected to any Wi-Fi networks. If they are connected, disconnect them first. Connect your Apple TV and iOS to the same Wi-Fi network again.