All worked fine, streaming Plex content from my software based Plex server sitting on my Mac mini that was connected Wi-Fi to my router at home across the internets to the Marriott Wi-Fi network then to my phone and to Apple TV, phew……. it all worked seamlessly even 720 P HD movies. But a day or two later I ran into an issue, only my brand spanking new I phone 7+ could connect to the network everything else my iPad air2, a MacBook Pro, MacBook air, and Iphone 6S plus could not see the Apple TV. Hmmmmm….
I tried the usual stuff, even went into the network settings of the AppleTV and changed the DNS server. There’s also a tweak to spoof the Mac address and get it to connect to the network. The interesting thing was that the AppleTV could not I believe see outside the wi-Fi network, I think Marriott was blocking the device but obviously it was on the same network as the iPhone as this Apple TV third-generation does require it to be connected to the same Wi-Fi network has the device you are airplaying from – 3rd gen does not have the pier to Pier I believe that the new fourth generation onward Apple TVs have. I resigned myself to the fact that the perhaps Marriott was blocking the device on the internal network now. As even my iPhone 7 could not see it. By chance I ended up going into security settings on the appletv turning password off but just I checked the option to verify device. I tried to connect and my iPhone was back in business and now all the devices instantly saw it – some kind of bug?
Not sure, but in summary if you’re having problems with airplay turn password off and check the verify devices option.