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)

uname -r:


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.

  • Nano usb model? – Rui F Ribeiro May 1 '19 at 22:20
  • The full model number as specified by the manufacturer is 8853A-T2U, IIRC it did not have nano in its name. – technical_difficulty May 1 '19 at 22:22
  • Nano is the size. – Rui F Ribeiro May 1 '19 at 22:23
  • 1
    It is not a nano indeed. Mind you I live in a well populated area and not so far am airport, the ap had to be moved next to my couch to take advantage of the 5GHz speeds. I would bet my money you are dealing with WiFi "features". I asked about nano, because they do not work well. – Rui F Ribeiro May 2 '19 at 5:42
  • 1
    I live in a rural area not anywhere near an airport where there is only one other 5GHz network, so it's probably not interference. What do you mean with "WiFi features"? – technical_difficulty May 2 '19 at 10:17

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