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Moua14

pas de connection WiFi, mais réseau détecté

Bonjour a tous

Je viens d'installer Xubuntu 8.10 sur ma modeste machine (Athlon 2600+; 256M RAM) je branche ma clé WiFi (Sagem XG 703A) elle est reconnue sans soucis, je vais voir dans NetWorkManager, il trouve bien mon résau (NEUF_CE28)je clique sur connexion, et il ne veut pas se connecter.
Pour etre précis, après plus d'une minute de tentative de connexion, il me dit "The network connection has been deconnected"
Je précise qu'il n'y a pas de clé WPA

quentin@quentin-desktop:~$ lsusb

Bus 003 Device 007: ID 0cde:0008 Z-Com Sitecom Wireless Network Adapter 100G+ WL-125
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

quentin@quentin-desktop:~$ lspci
00:00.0 Host bridge: nVidia Corporation nForce2 IGP2 (rev a2)
00:00.1 RAM memory: nVidia Corporation nForce2 Memory Controller 1 (rev a2)
00:00.2 RAM memory: nVidia Corporation nForce2 Memory Controller 4 (rev a2)
00:00.3 RAM memory: nVidia Corporation nForce2 Memory Controller 3 (rev a2)
00:00.4 RAM memory: nVidia Corporation nForce2 Memory Controller 2 (rev a2)
00:00.5 RAM memory: nVidia Corporation nForce2 Memory Controller 5 (rev a2)
00:01.0 ISA bridge: nVidia Corporation nForce2 ISA Bridge (rev a4)
00:01.1 SMBus: nVidia Corporation nForce2 SMBus (MCP) (rev a2)
00:02.0 USB Controller: nVidia Corporation nForce2 USB Controller (rev a4)
00:02.1 USB Controller: nVidia Corporation nForce2 USB Controller (rev a4)
00:02.2 USB Controller: nVidia Corporation nForce2 USB Controller (rev a4)
00:04.0 Ethernet controller: nVidia Corporation nForce2 Ethernet Controller (rev a1)
00:06.0 Multimedia audio controller: nVidia Corporation nForce2 AC97 Audio Controler (MCP) (rev a1)
00:08.0 PCI bridge: nVidia Corporation nForce2 External PCI Bridge (rev a3)
00:09.0 IDE interface: nVidia Corporation nForce2 IDE (rev a2)
00:1e.0 PCI bridge: nVidia Corporation nForce2 AGP (rev a2)
01:08.0 Modem: Smart Link Ltd. SmartLink SmartPCI562 56K Modem (rev 03)
02:00.0 VGA compatible controller: ATI Technologies Inc RV280 [Radeon 9200 SE] (rev 01)
02:00.1 Display controller: ATI Technologies Inc RV280 [Radeon 9200 SE] (Secondary) (rev 01)

quentin@quentin-desktop:~$ sudo lshw -C network
[sudo] password for quentin: 
  *-network               
       description: Ethernet interface
       product: nForce2 Ethernet Controller
       vendor: nVidia Corporation
       physical id: 4
       bus info: pci@0000:00:04.0
       logical name: eth0
       version: a1
       serial: 00:0c:6e:ea:10:80
       size: 100MB/s
       capacity: 100MB/s
       width: 32 bits
       clock: 66MHz
       capabilities: pm bus_master cap_list ethernet physical mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=forcedeth driverversion=0.61 duplex=full ip=192.168.1.21 latency=0 link=yes maxlatency=20 mingnt=1 module=forcedeth multicast=yes port=MII speed=100MB/s
  *-network:0 DISABLED
       description: Ethernet interface
       physical id: 1
       logical name: pan0
       serial: b2:1e:74:09:00:e3
       capabilities: ethernet physical
       configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A link=yes multicast=yes
  *-network:1
       description: Wireless interface
       physical id: 2
       logical name: wlan0
       serial: 00:60:b3:dc:33:d8
       capabilities: ethernet physical wireless
       configuration: broadcast=yes multicast=yes wireless=IEEE 802.11bg

quentin@quentin-desktop:~$ iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

pan0      no wireless extensions.

wmaster0  no wireless extensions.

wlan0     IEEE 802.11bg  ESSID:"NEUF_CE28"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: Not-Associated   
          Tx-Power=27 dBm   
          Retry min limit:7   RTS thr:off   Fragment thr=2352 B   
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

quentin@quentin-desktop:~$ ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0c:6e:ea:10:80  
          inet adr:192.168.1.21  Bcast:192.168.1.255  Masque:255.255.255.0
          adr inet6: fe80::20c:6eff:feea:1080/64 Scope:Lien
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:973 erreurs:0 :0 overruns:0 frame:0
          TX packets:930 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000 
          Octets reçus:693655 (693.6 KB) Octets transmis:142771 (142.7 KB)
          Interruption:22 Adresse de base:0x2000 

lo        Link encap:Boucle locale  
          inet adr:127.0.0.1  Masque:255.0.0.0
          adr inet6: ::1/128 Scope:Hôte
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          Packets reçus:90 erreurs:0 :0 overruns:0 frame:0
          TX packets:90 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:0 
          Octets reçus:5305 (5.3 KB) Octets transmis:5305 (5.3 KB)

wlan0     Link encap:Ethernet  HWaddr 00:60:b3:dc:33:d8  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000 
          Octets reçus:0 (0.0 B) Octets transmis:0 (0.0 B)

wmaster0  Link encap:UNSPEC  HWaddr 00-60-B3-DC-33-D8-00-00-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          Packets reçus:0 erreurs:0 :0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 lg file transmission:1000 
          Octets reçus:0 (0.0 B) Octets transmis:0 (0.0 B)

quentin@quentin-desktop:~$ sudo iwlist scan
lo        Interface doesn't support scanning.

eth0      Interface doesn't support scanning.

pan0      Interface doesn't support scanning.

wmaster0  Interface doesn't support scanning.

wlan0     Scan completed :
          Cell 01 - Address: 00:17:33:E1:CE:29
                    ESSID:"NEUF_CE28"
                    Mode:Master
                    Channel:11
                    Frequency:2.462 GHz (Channel 11)
                    Quality=45/100  Signal level:58/127  
                    Encryption key:off
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s; 6 Mb/s; 9 Mb/s
                              12 Mb/s; 48 Mb/s
                    Extra:tsf=000000022f1cd008
                    Extra: Last beacon: 228ms ago

quentin@quentin-desktop:~$ cat  /etc/network/interfaces
auto lo
iface lo inet loopback



iface wlan0 inet dhcp
wireless-essid NEUF_CE28

auto wlan0

quentin@quentin-desktop:~$ nm-tool

NetworkManager Tool

State: connected

- Device: eth0 ----------------------------------------------------------------
  Type:              Wired
  Driver:            forcedeth
  State:             connected
  Default:           yes
  HW Address:        00:0C:6E:EA:10:80

  Capabilities:
    Supported:       yes
    Carrier Detect:  yes
    Speed:           100 Mb/s

  Wired Settings

  IPv4 Settings:
    Address:         192.168.1.21
    Prefix:          24 (255.255.255.0)
    Gateway:         192.168.1.1

    DNS:             192.168.1.1


- Device: wlan0 ----------------------------------------------------------------
  Type:              802.11 WiFi
  Driver:            prism54usb
  State:             disconnected
  Default:           no
  HW Address:        00:60:B3:DC:33:D8

  Capabilities:
    Supported:       yes

  Wireless Settings
    WEP Encryption:  yes
    WPA Encryption:  yes
    WPA2 Encryption: yes

  Wireless Access Points
    NEUF_CE28:       Infra, 00:17:33:E1:CE:29, Freq 2462 MHz, Rate 54 Mb/s, Strength 54

Merci d'avance