Stan1700

Q: Wifi issues with Sierra?

Upgraded to Sierra last week, and noticed that my MBA is unable to log into some of my existing 5GHz wifi SSIDs. Here's what's happening:

 

Using iPhone 6

SSID A 2.4GHz               OK

SSID A 5GHz                  OK   

SSID B 2.4GHz               OK

SSID B 5GHz                  OK   

Time Capsule2.4GHz     OK

Time Capsule 5GHz       OK

 

Using iPad Air 2

SSID A 2.4GHz               OK

SSID A 5GHz                  OK   

SSID B 2.4GHz               OK

SSID B 5GHz                  OK   

Time Capsule2.4GHz     OK

Time Capsule 5GHz       OK

 

Using MacBook Air (MBA) on Sierra v10.12

SSID A 2.4GHz               OK

SSID A 5GHz                  Cannot connect   

SSID B 2.4GHz               Cannot detect SSID

SSID B 5GHz                  Cannot connect   

Time Capsule2.4GHz     OK

Time Capsule 5GHz       OK

 

Note: MBA was within 2m of the respective wifi router during testing.

 

Everything was going fine until I upgraded to Sierra, and I did not change any settings on any device during this time. What is confusing is other devices are ok (iPads, iPhones, Samsung/other mobile phones, etc.) work fine with the existing wifi SSIDs, only MBA is giving me headaches.

 

A tech professional helped us setup our network, and since nothing was modified during this period of time, I am wondering if Sierra is the issue, and if anyone has the same problem, hopefully with a simple workaround or solution in hand, thanks!

MacBook Air, macOS Sierra (10.12)

Posted on Oct 6, 2016 8:43 PM