I have a new AirPort Extreme Base Station with 802.11ac support. It is set up and running fine with my Macs in the house; however, Airport Utility 6.3 (latest version) does not see my AirPort Express, even after a factory reset. Any ideas how to get it to show up in AirPort Utility? Edit: Rebooted my MBA and re-reset the Express and now AU6.3 sees the Express; however, after setting it up I get the perfectly meaningful and clear message in AU: An unexpected error occurred. Try again. Really? WTH kind of message is this? Edit 2: I found the solution! Randomly unplug and plug-in, push the reset button for various amounts of time and eventually it'll work. Sheesh. This networking stuff is really unApple-like.