airport utility app
I have tried for two days to get the Airport Utility App to work on my Mac Mini running OS X Yosemite 10.10.5 and using the Airport Extreme Router. Finally I got the app to work. Simply turn off the Firewall. I'm using McAfee Internet Security and I disabled it from there. Not sure what would happen if I was not running and internet security app.
Mac mini, OS X Mountain Lion