Is this a computer to computer for sharing attempt? For one & also I use AirPort to go on line. What’s this trying to do for in my iMac there is a Network Utility this is to another iMac on the premise & a printer connection. From what I think I am seeing but there are also other port attempts to window file sharing & So forth. When the iTunes goes on the effort to sniff for a port jumps. Someone knows I’m on but NIS is doing its job. I also redid my subscription to NIS I don’t see much in the 2012 do to it would be the same as 2011 for my version of iMac