Unable to connect after connection is dropped under Ubuntu

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Hi all,

I met a weird connection problem while using WiMAX service with Intel
6250 under Ubuntu.

Suppose my laptop is connected to WiMAX successfully while the signal
strength is better than 'Fair', and then I move an area with 'Poor' link
status, the connection will be dropped as expected:
--------
[2010/09/08 14:05:34] MESSAGE SYSTEM STATE UPDATE ARRIVED
System State: Ready
Connect Progress Info: Not Applicable
SW Radio: On
HW Radio: On
State Reason: Disconnect - Drop
--------

But then I go back where I initialized the connection, I cannot connect
to the same NSP anymore even the scanned result is 'Good':
--------
Network found.
NSP : XXXXXX
ID : xxxx
Signal : Good
RSSI : -73 dBm
CINR : 18 dB
Network Type: Home Network
Activated
--------

wimax_monitor always shows "Fail to Connect - EAP Auth" connection error:
--------
[2010/09/08 14:20:32] MESSAGE DEVICE STATUS UPDATE ARRIVED
Device Status: Connecting
Connection Progress: EAP Auth (Device)
[2010/09/08 14:20:52] MESSAGE SYSTEM STATE UPDATE ARRIVED
System State: Ready
Connect Progress Info: Not Applicable
SW Radio: On
HW Radio: On
State Reason: Fail to Connect - EAP Auth
--------

However the scenario does not happen under Windows 7. I can connect to
the same NSP after my connection is dropped.

OS: Ubuntu 10.04
Device: Intel(R) Centrino(R) Advanced-N + WiMAX 6250
Kernel: 2.6.32-24-generic
wimaxd: 1.5
wimax-tools: 1.4.3
Driver: obtained from
git://git.kernel.org/pub/scm/linux/kernel/git/inaky/compat-wimax.git

The steps I connect to WiMAX NSP:
* # compat-wimax/load.sh
* # wimaxd -b
* # wimaxcu scan
* # wimaxcu connect network NSP

Does anyone have the same problem or the solution of this?

Thanks,
Anderson Fang
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