knetworkmanager error

[roberto <roberto03@gmail.com>]

hello, i find the following problem while connecting to Internet by
knetworkmanager:

my system:
1. OS: debian lenny 5.0
2. kernel: 2.6.26
3. kde: 3.5

knetworkmanager detects all available wireless networks in the area,
using a device
assigned to "eth1";
then, i select my personal network and it starts to configure the
wireless device and to assign it an IP address;
after that few seconds, it exits reporting this error: "connection failure";

here i paste some additional data which may hopefully help:

file /etc/network/interfaces:
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback
################################


output of $dmesg | grep ipw2200
[   10.132376] ipw2200: Intel(R) PRO/Wireless 2200/2915 Network
Driver, 1.2.2kmprq
[   10.132428] ipw2200: Copyright(c) 2003-2006 Intel Corporation
[   11.072075] ipw2200: Detected Intel PRO/Wireless 2200BG Network Connection
[   11.072156] firmware: requesting ipw2200-bss.fw
[   11.284236] ipw2200: Detected geography ZZM (11 802.11bg channels,
0 802.11a channels)


file /etc/udev/rules.d/70-persistent-net.rules
# This file was automatically generated by the /lib/udev/write_net_rules
# program, probably run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single line.
# MAC addresses must be written in lowercase.

SUBSYSTEM=="net", DRIVERS=="?*", ATTRS{address}=="00:11:43:44:11:da",
NAME="eth0"

# PCI device 0x8086:0x4220 (ipw2200)
SUBSYSTEM=="net", DRIVERS=="?*", ATTR{address}=="00:0e:35:af:7a:3c",
NAME="eth1"


if anything else needed, please tell me;

thank you very much
-- 
roberto