I have the same problem for more than one year. Sometime I even felt a
little disappointed about Linux (This not only happened under Ubuntu, It
happened under some other distributions too, for example, Arch),
especially when I was having a meeting and wanting to show something to
the professor over ssh: the network just dropped out every minutes or
just can not connect.

Back to about two years ago, I used Ubuntu 10.04, there is no this
problem. I switched to then newer 11.04  because of a problem with the
display card driver, then this problem started to occur. I goggled and
tried every workaround I found (I even bought a new network card), no
one can completely solve the problem.  I can connect to my home network
without a problem, but when came to the campus network, many problems
happened: I can connect to it in my office with several dropouts a day.
I can not connect to it or the network dropped out every minutes when I
was in a professors office, which is in the same building but on a
different floor, and can not connect to it in the library in the same
building . I kept installing new versions of Ubuntu and upgraded to new
kernels, but the problem is still here.

>From the output of dmesg, I noticed that there were usually two cases:
1.  authentication timed out. 2.  deauthenticated from the network
quickly after a successful connection by local choice with reason number
either 2 or 3.

I don't think this is overcrowd related, because Windows works, iOS
works, and even wicd works(not perfectly). And this also happens on
another Ubuntu laptop of one of my office mates.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/924082

Title:
  NM fails to connect to campus Wi-Fi network; wicd succeeds -- Centrino
  Ultimate-N 6300 iwlwifi

Status in “network-manager” package in Ubuntu:
  Confirmed

Bug description:
  The iwlwifi drivers give exceptional performance on all APs I have
  connected to, be they WEP, WPA or open. The only time this system lets
  me down is when connecting to my campus wireless network.
  NetworkManager will only sometimes connect, and even manually
  configuring with iwconfig does not always work.

  The error usually given is either:

  Jan 30 01:07:51 Beast kernel: [ 8777.748471] wlan0: direct probe to 
00:1a:1e:a0:3b:c0 (try 1/3)
  Jan 30 01:07:51 Beast kernel: [ 8777.945384] wlan0: direct probe to 
00:1a:1e:a0:3b:c0 (try 2/3)
  Jan 30 01:07:51 Beast kernel: [ 8778.144952] wlan0: direct probe to 
00:1a:1e:a0:3b:c0 (try 3/3)
  Jan 30 01:07:52 Beast kernel: [ 8778.344474] wlan0: direct probe to 
00:1a:1e:a0:3b:c0 timed out

  or:

  Nov 30 19:01:27 Beast kernel: [ 1924.850725] wlan0: authenticate with 
00:24:6c:60:d0:00 (try 1)
  Nov 30 19:01:27 Beast kernel: [ 1924.852183] wlan0: 00:24:6c:60:d0:00 denied 
authentication (status 17)

  Other people report that this error may be linked to MAC filtering by
  the AP, but this should not be the case: my old computer with a
  Broadcom BCM4312 had no trouble.

  This bug is also different from several bug reports that complain of
  limited speed or packet loss: when I can connect, the connection is
  flawless. But very often I cannot connecct. The connection is
  generally worse in crowded areas, or areas with many access points.

  lspci:
  Network controller [0280]: Intel Corporation Centrino Ultimate-N 6300 
[8086:4238] (rev 3e)

  ifconfig wlan0:
  wlan0     Link encap:Ethernet  HWaddr 24:77:03:26:e8:50
            inet addr:130.64.153.137  Bcast:130.64.153.255  Mask:255.255.255.0
            inet6 addr: fe80::2677:3ff:fe26:e850/64 Scope:Link
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:1288307 errors:0 dropped:0 overruns:0 frame:0
            TX packets:296448 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1000
            RX bytes:1016044127 (1.0 GB)  TX bytes:27674773 (27.6 MB)

   iwconfig wlan0:
  wlan0     IEEE 802.11abgn  ESSID:"tuftswireless"
            Mode:Managed  Frequency:5.785 GHz  Access Point: 00:24:6C:60:D0:10
            Bit Rate=300 Mb/s   Tx-Power=15 dBm
            Retry  long limit:7   RTS thr:off   Fragment thr:off
            Power Management:off
            Link Quality=61/70  Signal level=-49 dBm
            Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
            Tx excessive retries:2749  Invalid misc:7   Missed beacon:0

  lsmod | grep iw:
  iwlwifi               320164  0
  mac80211              506154  1 iwlwifi
  cfg80211              209294  2 iwlwifi,mac80211

  dmesg | grep wlan:

  [   12.059405] wlan0: direct probe to 00:24:6c:60:d0:00 (try 1/3)
  [   12.258109] wlan0: direct probe to 00:24:6c:60:d0:00 (try 2/3)
  [   12.457695] wlan0: direct probe to 00:24:6c:60:d0:00 (try 3/3)
  [   12.657205] wlan0: direct probe to 00:24:6c:60:d0:00 timed out
  [   20.624778] wlan0: direct probe to 00:24:6c:60:d0:00 (try 1/3)
  [   20.822683] wlan0: direct probe to 00:24:6c:60:d0:00 (try 2/3)
  [   21.022217] wlan0: direct probe to 00:24:6c:60:d0:00 (try 3/3)
  [   21.221788] wlan0: direct probe to 00:24:6c:60:d0:00 timed out
  [   29.105117] wlan0: direct probe to 00:24:6c:60:d0:00 (try 1/3)
  [   29.303463] wlan0: direct probe to 00:24:6c:60:d0:00 (try 2/3)
  [   29.503007] wlan0: direct probe to 00:24:6c:60:d0:00 (try 3/3)
  [   29.702581] wlan0: direct probe to 00:24:6c:60:d0:00 timed out
  [   37.888734] wlan0: direct probe to 00:24:6c:60:d0:00 (try 1/3)
  [   38.087513] wlan0: direct probe to 00:24:6c:60:d0:00 (try 2/3)
  [   38.287083] wlan0: direct probe to 00:24:6c:60:d0:00 (try 3/3)
  [   38.486602] wlan0: direct probe to 00:24:6c:60:d0:00 timed out
  [   46.376942] wlan0: authenticate with 00:24:6c:60:d0:00 (try 1)
  [   46.411091] wlan0: 00:24:6c:60:d0:00 denied authentication (status 17)

  syslog:

  Nov 30 19:01:27 Beast kernel: [ 1924.850725] wlan0: authenticate with 
00:24:6c:60:d0:00 (try 1)
  Nov 30 19:01:27 Beast kernel: [ 1924.852183] wlan0: 00:24:6c:60:d0:00 denied 
authentication (status 17)
  Nov 30 19:02:24 Beast NetworkManager[1332]: <warn> Activation 
(wlan0/wireless): association took too long, failing activation.
  Nov 30 19:02:24 Beast NetworkManager[1332]: <info> (wlan0): device state 
change: config -> failed (reason 'supplicant-timeout') [50 120 11]
  Nov 30 19:02:24 Beast NetworkManager[1332]: <warn> Activation (wlan0) failed 
for access point (tuftswireless)
  Nov 30 19:02:24 Beast NetworkManager[1332]: <warn> Activation (wlan0) failed.
  Nov 30 19:02:24 Beast NetworkManager[1332]: <info> (wlan0): device state 
change: failed -> disconnected (reason 'none') [120 30 0]
  Nov 30 19:02:24 Beast NetworkManager[1332]: <info> (wlan0): deactivating 
device (reason 'none') [0]
  Nov 30 19:02:24 Beast NetworkManager[1332]: <info> (wlan0): supplicant 
interface state: authenticating -> disconnected
  Nov 30 19:02:24 Beast NetworkManager[1332]: <warn> Couldn't disconnect 
supplicant interface: This interface is not connected.
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Auto-activating connection 
'Auto hpsetup'.
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Activation (wlan0) 
starting connection 'Auto hpsetup'
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> (wlan0): device state 
change: disconnected -> prepare (reason 'none') [30 40 0]
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Activation (wlan0) Stage 1 
of 5 (Device Prepare) scheduled...
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Activation (wlan0) Stage 1 
of 5 (Device Prepare) started...
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Activation (wlan0) Stage 2 
of 5 (Device Configure) scheduled...
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Activation (wlan0) Stage 1 
of 5 (Device Prepare) complete.
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Activation (wlan0) Stage 2 
of 5 (Device Configure) starting...
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> (wlan0): device state 
change: prepare -> config (reason 'none') [40 50 0]
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Activation 
(wlan0/wireless): connection 'Auto hpsetup' requires no security.  No secrets 
needed.
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Config: added 'ssid' value 
'tuftswireless'
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Config: added 'scan_ssid' 
value '1'
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Config: added 'key_mgmt' 
value 'NONE'
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Activation (wlan0) Stage 2 
of 5 (Device Configure) complete.
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> Config: set interface 
ap_scan to 1
  Nov 30 19:02:27 Beast NetworkManager[1332]: <info> (wlan0): supplicant 
interface state: disconnected -> scanning
  Nov 30 19:02:30 Beast wpa_supplicant[6090]: Trying to authenticate with 
00:24:6c:60:d0:00 (SSID='tuftswireless' freq=2437 MHz)
  Nov 30 19:02:30 Beast NetworkManager[1332]: <info> (wlan0): supplicant 
interface state: scanning -> authenticating
  Nov 30 19:02:30 Beast kernel: [ 1987.684183] wlan0: authenticate with 
00:24:6c:60:d0:00 (try 1)
  Nov 30 19:02:30 Beast kernel: [ 1987.687421] wlan0: 00:24:6c:60:d0:00 denied 
authentication (status 17)

  sudo iwlist scan:

  wlan0     Scan completed :
            Cell 01 - Address: 00:24:6C:60:D0:10
                      Channel:157
                      Frequency:5.785 GHz
                      Quality=57/70  Signal level=-53 dBm
                      Encryption key:off
                      ESSID:"tuftswireless"
                      Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                                54 Mb/s
                      Mode:Master
                      Extra:tsf=0000005a132e5c6a
                      Extra: Last beacon: 76ms ago
                      IE: Unknown: 000D7475667473776972656C657373
                      IE: Unknown: 010698243048606C
                      IE: Unknown: 03019D
                      IE: Unknown: 
2D1A4E001BFFFF000000000000000000000000000000000000000000
                      IE: Unknown: 
3D169D051B000000FF000000000000000000000000000000
                      IE: Unknown: 
DD1E00904C334E001BFFFF000000000000000000000000000000000000000000
                      IE: Unknown: 
DD1A00904C349D051B000000FF000000000000000000000000000000
                      IE: Unknown: 
DD180050F2020101800003A4000027A4000042435E0062322F00
                      IE: Unknown: DD0A00037F04010000000000
            Cell 02 - Address: 00:0B:86:58:19:A0
                      Channel:1
                      Frequency:2.412 GHz (Channel 1)
                      Quality=39/70  Signal level=-71 dBm
                      Encryption key:off
                      ESSID:"tuftswireless"
                      Bit Rates:2 Mb/s; 6 Mb/s; 9 Mb/s; 11 Mb/s; 12 Mb/s
                                18 Mb/s; 24 Mb/s; 36 Mb/s
                      Bit Rates:48 Mb/s; 54 Mb/s
                      Mode:Master
                      Extra:tsf=0000000202533181
                      Extra: Last beacon: 9104ms ago
                      IE: Unknown: 000D7475667473776972656C657373
                      IE: Unknown: 0108840C121618243048
                      IE: Unknown: 030101
                      IE: Unknown: 2A0100
                      IE: Unknown: 3202606C
                      IE: Unknown: 
DD180050F2020101800003A4000027A4000042435E0062322F00
                      IE: Unknown: DD0A00037F04010000000000
            Cell 03 - Address: 00:24:6C:60:CF:A0
                      Channel:6
                      Frequency:2.437 GHz (Channel 6)
                      Quality=50/70  Signal level=-60 dBm
                      Encryption key:off
                      ESSID:"tuftswireless"
                      Bit Rates:2 Mb/s; 11 Mb/s; 6 Mb/s; 9 Mb/s; 12 Mb/s
                                18 Mb/s; 24 Mb/s; 36 Mb/s
                      Bit Rates:48 Mb/s; 54 Mb/s
                      Mode:Master
                      Extra:tsf=0000000c808e35af
                      Extra: Last beacon: 8704ms ago
                      IE: Unknown: 000D7475667473776972656C657373
                      IE: Unknown: 010884160C1218243048
                      IE: Unknown: 030106
                      IE: Unknown: 050400010100
                      IE: Unknown: 2A0100
                      IE: Unknown: 3202606C
                      IE: Unknown: 
2D1A4C101BFFFF000000000000000000000000000000000000000000
                      IE: Unknown: 
3D1606001B000000FF000000000000000000000000000000
                      IE: Unknown: 
DD1E00904C334C101BFFFF000000000000000000000000000000000000000000
                      IE: Unknown: 
DD1A00904C3406001B000000FF000000000000000000000000000000
                      IE: Unknown: 
DD180050F2020101800003A4000027A4000042435E0062322F00
                      IE: Unknown: DD0A00037F04010000000000
            Cell 04 - Address: 00:0B:86:58:1F:A0
                      Channel:11
                      Frequency:2.462 GHz (Channel 11)
                      Quality=38/70  Signal level=-72 dBm
                      Encryption key:off
                      ESSID:"tuftswireless"
                      Bit Rates:2 Mb/s; 11 Mb/s; 6 Mb/s; 9 Mb/s; 12 Mb/s
                                18 Mb/s; 24 Mb/s; 36 Mb/s
                      Bit Rates:48 Mb/s; 54 Mb/s
                      Mode:Master
                      Extra:tsf=00000006687da181
                      Extra: Last beacon: 7328ms ago
                      IE: Unknown: 000D7475667473776972656C657373
                      IE: Unknown: 010884160C1218243048
                      IE: Unknown: 03010B
                      IE: Unknown: 050400010180
                      IE: Unknown: 2A0102
                      IE: Unknown: 3202606C
                      IE: Unknown: 
DD180050F2020101800003A4000027A4000042435E0062322F00
                      IE: Unknown: DD0A00037F04010000000000
            Cell 05 - Address: 00:24:6C:60:CF:B0
                      Channel:36
                      Frequency:5.18 GHz (Channel 36)
                      Quality=41/70  Signal level=-69 dBm
                      Encryption key:off
                      ESSID:"tuftswireless"
                      Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                                54 Mb/s
                      Mode:Master
                      Extra:tsf=0000002e94c969ed
                      Extra: Last beacon: 7072ms ago
                      IE: Unknown: 000D7475667473776972656C657373
                      IE: Unknown: 010698243048606C
                      IE: Unknown: 030124
                      IE: Unknown: 
2D1A4E001BFFFF000000000000000000000000000000000000000000
                      IE: Unknown: 
3D1624050A000000FF000000000000000000000000000000
                      IE: Unknown: 
DD1E00904C334E001BFFFF000000000000000000000000000000000000000000
                      IE: Unknown: 
DD1A00904C3424050A000000FF000000000000000000000000000000
                      IE: Unknown: 
DD180050F2020101800003A4000027A4000042435E0062322F00
                      IE: Unknown: DD0A00037F04010000000000
            Cell 06 - Address: 00:0B:86:59:FD:C8
                      Channel:40
                      Frequency:5.2 GHz (Channel 40)
                      Quality=31/70  Signal level=-79 dBm
                      Encryption key:off
                      ESSID:"tuftswireless"
                      Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                                54 Mb/s
                      Mode:Master
                      Extra:tsf=0000005a137c235f
                      Extra: Last beacon: 6560ms ago
                      IE: Unknown: 000D7475667473776972656C657373
                      IE: Unknown: 010698243048606C
                      IE: Unknown: 030128
                      IE: Unknown: 
DD180050F2020101800003A4000027A4000042435E0062322F00
                      IE: Unknown: DD0A00037F04010000000000
            Cell 07 - Address: 00:24:6C:60:D5:50
                      Channel:44
                      Frequency:5.22 GHz (Channel 44)
                      Quality=37/70  Signal level=-73 dBm
                      Encryption key:off
                      ESSID:"tuftswireless"
                      Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                                54 Mb/s
                      Mode:Master
                      Extra:tsf=0000005a1328778d
                      Extra: Last beacon: 6336ms ago
                      IE: Unknown: 000D7475667473776972656C657373
                      IE: Unknown: 010698243048606C
                      IE: Unknown: 03012C
                      IE: Unknown: 
2D1A4E001BFFFF000000000000000000000000000000000000000000
                      IE: Unknown: 
3D162C0508000000FF000000000000000000000000000000
                      IE: Unknown: 
DD1E00904C334E001BFFFF000000000000000000000000000000000000000000
                      IE: Unknown: 
DD1A00904C342C0508000000FF000000000000000000000000000000
                      IE: Unknown: 
DD180050F2020101800003A4000027A4000042435E0062322F00
                      IE: Unknown: DD0A00037F04010000000000
            Cell 08 - Address: 00:0B:86:58:1F:A8
                      Channel:48
                      Frequency:5.24 GHz (Channel 48)
                      Quality=34/70  Signal level=-76 dBm
                      Encryption key:off
                      ESSID:"tuftswireless"
                      Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                                54 Mb/s
                      Mode:Master
                      Extra:tsf=0000005a13a8e1c3
                      Extra: Last beacon: 6124ms ago
                      IE: Unknown: 000D7475667473776972656C657373
                      IE: Unknown: 010698243048606C
                      IE: Unknown: 030130
                      IE: Unknown: 
DD180050F2020101800003A4000027A4000042435E0062322F00
                      IE: Unknown: DD0A00037F04010000000000
            Cell 09 - Address: 00:24:6C:60:CF:F0
                      Channel:149
                      Frequency:5.745 GHz
                      Quality=37/70  Signal level=-73 dBm
                      Encryption key:off
                      ESSID:"tuftswireless"
                      Bit Rates:12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s; 48 Mb/s
                                54 Mb/s
                      Mode:Master
                      Extra:tsf=0000005a131955bb
                      Extra: Last beacon: 764ms ago
                      IE: Unknown: 000D7475667473776972656C657373
                      IE: Unknown: 010698243048606C
                      IE: Unknown: 030195
                      IE: Unknown: 
2D1A4E001BFFFF000000000000000000000000000000000000000000
                      IE: Unknown: 
3D16950508000000FF000000000000000000000000000000
                      IE: Unknown: 
DD1E00904C334E001BFFFF000000000000000000000000000000000000000000
                      IE: Unknown: 
DD1A00904C34950508000000FF000000000000000000000000000000
                      IE: Unknown: 
DD180050F2020101800003A4000027A4000042435E0062322F00
                      IE: Unknown: DD0A00037F04010000000000

  lsb_release -d:
  Description:    Ubuntu 11.10

  uname -a:
  Linux Beast 3.0.0-13-generic #22-Ubuntu SMP Wed Nov 2 13:27:26 UTC 2011 
x86_64 x86_64 x86_64 GNU/Linux

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/924082/+subscriptions

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