If you own a apple computer a iMac/Macbook or Macpro , then you probabely would have encountered this error. Your home wi-Fi router has dual channels a 2.4GHz & a faster 5 GHz channel. Now in my case my iMac late 2012 was not able to connect to my ASUS gigabit router which is dual channel.
I tried the following, all in vain
- RESET the ASUS router to default settings
- Clean install my iMac with latest OS Catalina
Still my router’s 5GHz network would show up in the ‘Network List’ but when connecting with corect password throws an error ” CANNOT BE CONNECTED TO NETWORK’
Check if your mac’s internal WiFi hardware support Dual Band !
5 GHz Network Band Capability Check on a Mac
1. Click the Apple icon located in the top-left portion of the screen and select About this Mac.
2. Click System Report on the menu displayed.
3. On the Left-hand side column, scroll down options until you see Network, then select the Wi-Fi option underneath it. Look for the “Supported PHY Modes: ” selection.
4. IF… the computer supports 802.11a/b/g/n Wireless Standards,
THEN… the computer has the 5 GHz Network Band Capability.
HOW I SOLVED THIS HARDWARE ERROR
Now in my case my computer supports 802.11a/b/g/n Wireless Standards, but still unable to connect to 5GHz external wi-Fi router. Various resources online point to a ‘Hardware Issue’ and suggest I replace my internal Airport Extreme card on my computer OR buy a latest Wi-Fi router.
Here is what I did, and it immediately resolved my issue
Login in to the Router using IP in my case was http://router.asus.com/Advanced_Wireless_Content.asp . Pls check back of your router
In control channel option I chose 149 to match my iMac’s Channel configuration. To access press ALT(Option) and click Wi-Fi icon on top bar.
At a minimum, your adapter must support 802.11g/n. Ideally, we would like ALL devices to support 802.11a/g/n.
If your device only supports 802.11a, it WILL WORK on the LSU wireless network; however, there may be locations on campus where your signal strength might not be ideal.