I'm using the Archer T2U as a WLAN adapter on my Debian machine and I cannot connect to my 5GHz home network. I can connect to my 2.4GHz network without any problems.
Bus 002 Device 002: ID 148f:761a Ralink Technology, Corp. MT7610U ("Archer T2U" 2.4G+5G WLAN Adapter
[ 86.913331] wlan0: authenticate with XX:XX:XX:XX:XX:XX [ 86.965513] wlan0: send auth to XX:XX:XX:XX:XX:XX (try 1/3) [ 86.966267] wlan0: authenticated [ 86.968872] wlan0: associate with XX:XX:XX:XX:XX:XX (try 1/3) [ 86.969758] wlan0: RX AssocResp from XX:XX:XX:XX:XX:XX (capab=0x511 status=12 aid=11128) [ 86.969759] wlan0: XX:XX:XX:XX:XX:XX denied association (code=12)
The 802.11 spec states that the code 12 stands for:
Association denied due to reason outside the scope of this standard
and Cisco's website lists this as an example:
Example : When controller receives assoc from an unknown or disabled SSID
Is my router causing this issue? I assume it's not the driver since this is a fresh Debian installation and I doubt it's a hardware fault in the adapter since it is relatively new.
When using the adapter with a Windows machine it frequently disconnects from the 5GHz network but works flawlessly on the 2.4GHz network.