Public bug reported:

Binary package hint: network-manager

Gutsy 64-bit Tribe-5 + updates to 17th September 2007.

network-manager Version: 0.6.5-0ubuntu11

I've been happily running two Linksys Wifi access points (WRT54GL &
WAP54G) with WPA-PSK using the stock Linksys firmware. Because the
WAP54G couldn't support WPA2 I had them both set to use WPA-Personal.

Today I decided to replace the firmware in both with the latest dd-wrt:

WAP54G Firmware: DD-WRT v24 RC-3 (09/13/07) micro - build 7957
WRT54GL Firmware:  DD-WRT v24 RC-3 (09/13/07) vpn - build 7957

I then enabled WPA2-Personal on both.

NetworkManager just couldn't get a connection and there weren't any
clues. After a lot of trial-and-error I discovered it is possible to
connect if both APs are set to WPA. I did some searching and found an
email by Brain Millet in June to the Gnome Network Manager mailing list:

http://mail.gnome.org/archives/networkmanager-
list/2007-June/msg00053.html

In it Brian reports discovering that NetworkManager (or is it nm-
applet?) tries to use the existing WPA network configuration stored by
gconfd, rather than detecting the AP(s) are now wanting WPA2 and
updating the connection method and key details. In effect it tries to
use stale configuration values.

The solution is to delete the configuration. To report all known
networks (ESSIDs) and then choose a single one do this:

$ gconftool -R /system/networking/wireless/networks

To delete all networks:

$ gconftool --recursive-unset /system/networking/wireless/networks

or to delete just <essid>

$ gconftool --recursive-unset
/system/networking/wireless/networks/<essid>

or, using gconf-editor navigate to:

/system/networking/wireless/networks/

Select the network name and in the right-pane delete each of the keys.

Now use nm-applet to reconnect to the network. A dialog will appear
asking for the "WPA2-Personal" pass-phrase. Type it in and
NetworkManager will connect and save the new settings.

>From now on WPA2 connections will work.

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

-- 
[Gutsy] Unable to connect to WPA2 if the AP was previously using WPA
https://bugs.launchpad.net/bugs/140422
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