Apple TV is telling me it can't connect to the server.
My WiFi connection is working fine throughout the house; ATV has been working fine previously, but now it says that it's not connected to the server. I've unplugged ATV from my TV monitor and plugged it back in; I've checked the WiFi router. Any suggestions for solving this are appreciated!
iMac, OS X Yosemite (10.10.2)