Whenever I try to login to Messages, FaceTime, iTunes, it loads for an extended period of time, then it says login failed. I haven't been able to use any of them extensively for a while now. They were working up until I updated to El Capitan when it first came out. Any solutions out there? Late 2011 13inch MacBook Pro running Sierra
MacBook Pro (13-inch Late 2011), macOS Sierra (10.12), null
