I'm currently working in 13.04. The network manager indicates that the WIFI is always connected. However, the Internet connection only last a few seconds and then it disconnects. The problem only exist when I want to connect to a WPA2-Enterprise protected network. There is not problem if I connect another unprotected network.

I have tried the nohwcrypt=1 method, but it does not help.

What can be the problem? Let me know if you need any further information.


  • Open a terminal and enter lspci | grep WiFi. Post the result as edit. – s3lph Oct 2 '13 at 19:59
  • @the_Seppi Thanks, but the result is empty. But the last line, if I type lspci, is 04:00.0 Network controller: Atheros Communications Inc. AR9485 Wireless Network Adapter (rev 01) – Yifan Sun Oct 2 '13 at 20:04
  • Did you install a proprietary diver or do you use the preinstalled one? – s3lph Oct 2 '13 at 20:07
  • @the_Seppi I did not install any drivers. I have just installed ubuntu for a few minutes. So I think I am using the preinstalled one. – Yifan Sun Oct 2 '13 at 20:08
  • Then check whether Atheros provides any Linux drivers for your card. – s3lph Oct 2 '13 at 20:10

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