NetworkManager connects to DHCP AP but dhclient doesn't

[Kamran Riaz Khan <krkhan inspirated com>]

I'm using iwlwifi drivers on my Fujitsu-Siemens Amilo Pro v3205
notebook. I have a wireless access point set up in my house which
provides DHCP access to its clients. Gnome's NetworkManager picks up the
settings just fine, however if I try dhclient, I get this:

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[root orthanc ~]# ifconfig wlan0 up
[root orthanc ~]# iwlist wlan0 scan
wlan0     Scan completed :
          Cell 01 - Address: 00:19:E0:6D:C5:8E
                    ESSID:"SS7"
                    Mode:Master
                    Channel:6
                    Frequency:2.437 GHz (Channel 6)
                    Quality=86/100  Signal level=-47 dBm  Noise
level=-85 dBm
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              12 Mb/s; 24 Mb/s; 36 Mb/s; 9 Mb/s; 18 Mb/s
                              48 Mb/s; 54 Mb/s
                    Extra:tsf=00000000098b074d

[root orthanc ~]# iwconfig wlan0 essid SS7
[root orthanc ~]# iwconfig wlan0 ap 00:19:E0:6D:C5:8E
[root orthanc ~]# iwconfig wlan0 channel 6
[root orthanc ~]# iwconfig wlan0 key s:abcde
[root orthanc ~]# iwconfig wlan0
wlan0     IEEE 802.11g  ESSID:"SS7"  Nickname:"SS7"
          Mode:Managed  Frequency:2.437 GHz  Access Point:
00:19:E0:6D:C5:8E
          Bit Rate=54 Mb/s   Tx-Power=27 dBm
          Retry min limit:7   RTS thr:off   Fragment thr=2346 B
          Encryption key:6E6F-6B69-61
          Power Management:off
          Link Quality=87/100  Signal level=-46 dBm  Noise level=-85 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

[root orthanc ~]# dhclient wlan0
Internet Systems Consortium DHCP Client V3.0.6-Fedora
Copyright 2004-2007 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/
wmaster0: unknown hardware address type 801
wmaster0: unknown hardware address type 801
Listening on LPF/wlan0/00:1b:77:1b:d9:17
Sending on   LPF/wlan0/00:1b:77:1b:d9:17
Sending on   Socket/fallback
DHCPREQUEST on wlan0 to 255.255.255.255 port 67
DHCPREQUEST on wlan0 to 255.255.255.255 port 67
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 21
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 18
DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 16
No DHCPOFFERS received.
Trying recorded lease 192.168.1.4
PING 192.168.1.1 (192.168.1.1) from 192.168.1.4 wlan0: 56(84) bytes of data.

--- 192.168.1.1 ping statistics ---
4 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2999ms
, pipe 3
No working leases in persistent database - sleeping.
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Any ideas about what I'm doing wrong?
--
Regards,
Kamran.
http://www.inspirated.com/