I'm am also having problems with wireless in Feisty, though in Ubuntu,
not kubuntu. I did a clean Feisty install on my dell inspiron 6000, with
an intel wireless card and using ipw2200 driver. I can connect to my
WPA2 network fine, and can transfer files over the network and ping
external IPs. However I cannot ping domain names. Nor can I access any
outside webpages, or connect to instant messengers, nor connect to ip
addresses. I tried changing my dns to opendns but this hasn't helped. I
turned off the encryption of my network and still see the same behavior.
So I tried installing wicd, but still saw the same exact behavior.
What's odd was that it worked at my friends apt on his WEP netgear
router, but not my linksys WPA2, WEP, nor even no encryption. It was a
bit slow with look ups and redirects though.

I looked at my /etc/network/interfaces file and saw this

Code:

auto lo
iface lo inet loopback

auto eth2
iface eth2 inet dhcp

auto ath0
iface ath0 inet dhcp

auto wlan0
iface wlan0 inet dhcp

iface eth0 inet dhcp

auto eth0

The weird thing is I don't have a eth2, ath0, or wlan0 interface. My wired 
network card is eth0 and my wireless card is eth1. So I added
Code:

auto eth1
iface eth1 inet dhcp

but nothing changed. I've tried manually stopping the network and
restarting to see no change. What's worse is that after I removed the
open dns servers from my router, when I restarted my laptop, my wired
connection stopped working (in the same way my wireless was, can connect
to network, but not out of network), so now I have no way to connect to
the internet after just a clean install of ubuntu.

This all worked fine under Edgy so I'd be really grateful for any help
or anything I can try to figure this out more.

-- 
Problems connecting to wireless with 64-bit WEP encryption and Intel Pro 2200 
wireless card using knetworkmanager in Feisty.
https://bugs.launchpad.net/bugs/108450
You received this bug notification because you are a member of Kubuntu
Team, which is a bug contact for knetworkmanager in ubuntu.

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