Wifi Help Needed

in Genius Bar
Hi. I could use some advice about problems I'm having with Wifi.

I have an Airport Extreme, model A1354. I also have an iPhone 5S running iOS 10.2 and I have a Mac Mini running macOS sierra.

Using the Airport Extreme, I have three Wifi networks: one 5Ghz, one 2.4 Ghz and another guest network, which I'm guessing is also 2.4 Ghz.

My iPhone is connected to the 2.4 Ghz network (not the guest network). I connect it to that network because I have some LIFX smart bulbs that are on the 2.4Ghz network; according to LIFX, the bulbs should not be on a 5Ghz network.

My Mac usually uses the 5Ghz network.

However, sometimes I use the 2.4 Ghz with my Mac. And today I've been unable to connect to it. When I try, I get the message: 

"The Wi-Fi network could not be joined. Try moving closer to the wireless router. Alternatively, run Wireless Diagnostics to troubleshoot."

My iPhone is still successfully connected to the 2.4Ghz network and I have even disconnected and reconnected with no problem -- but it's not working on my Mac. I've never seen this behavior before.

Usually when I can't connect to one of the Wifi networks, I simply reboot my Mac and the problem is solved. Today I've rebooted a few times and it made no difference.

I'd like to find out why I'm having the problem because I'm concerned my lights and my phone might also start having problems connecting to ti.

Any advice is appreciated. 



  • Reply 1 of 2
    I should add: connecting my Mac to the 5Ghz network and the guest network is still working fine.
  • Reply 2 of 2
    I just tried connecting my work MacBook Air to the 2.Ghz network and it worked. So for some reason the problem only has to do with my Mac Mini.
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