Some devices do not connect to the 5GHZ SSID - Authentication Error Occured

[glenfer]

Hi,

My services have been recently reconnected and upon trying the same router with existing devices. Most of my devices connect. But my Samsung phone and macbook pro computer do not connect to the 5GHZ SSID that I have setup. My phone connects to the 2.4 Ghz SSID. My wife has the same phone as I and her phone connects to the 5GHz SSID. 

My macbook pro is the main issue. This used to connect until Dec when my services were last active (before my home move). Now, my MBP does not connect. When I select my 5GHz network name and enter my WPA2 password, it just keeps prompting me to re-enter the password. It fails to authenticate. I have tried restarting my router, restarting my MBP, Clearing the system config on my MBP but it just does not connect. My MBP does not connect to the 2.4 Ghz network either.

Please help.

[KeithFrench]

Are the MBP & your phone in the same room as your wife's phone when they try to connect to the router?

[martswain]

Have you read this article ?

https://community.talktalk.co.uk/t5/Broadband/Weak-Security-Warning-on-Apple-IOS-and-Windows-10-or-1...