I tried setting up a Apple TV 3 in a corporate enviroment yesterday. Both the ATV and the iPhone 4 (5.1), MBA 2010 Lion was using the same guest network (wifi). I turned AirPlay on, and connected to the same network with phone and laptop. However I didn't get the AirPlay icon on either mobile music or in iTunes Lion. Since I dont have any insight to the network, could it be that it's blocking some ports? All the devices were on the same subnet, so there normally wouldt be any firewall in between those. No blocking between 184.108.40.206 and 220.127.116.11 that is. Does AirPlay require a certain connection strength or something like that? Or anything in particular set up in iTunes in Lion? After googling this issue online (obviously there are a lot of sources for error in a setup like this) I updated the ATV to the latest fw. But was't able to connect after that either. Any tips greatly appreciated.