No WPA2 connection; Connection failed (-7 unspecified failure)

I just finished installing MAC OS X 10.5.6 on a Macbook and am unable to connect to network using a new AirportExpress N with the following configuration:
WPA 2 Personal Security
SSID broadcast off
MAC filtering enabled
DHCP AUTOMATIC
Connection (Bridge Mode)
I find the following entry in the log:
1/5/09 5:07:55 PM SystemUIServer[212] Error joining Philippe II Network: Connection failed (-7 unspecified failure)
The weirdest thing is that as soon as I connect the macbook to the ethernet port (by cable) it get of course an ip address through the Ethernet port, after disconnecting (unplug) the AirPort also get an other ip address and works until it goes to sleep after waking up it troubles again?
Is there an problem with DHCP?
Does anyone have a solution?
Regards

To rule out an issue with WPA I would recommend not turning your SSID off or enabling MAC filtering. They they dont offer any extra security anyway they can easily got around. You only really need to use WPA2.
Then try connecting.

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    Bonjour,
    Je serai absent du 6 aout au 16 aout 2010.
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    Michel Desjardins

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    Rodrigo Mufalani
    www.mufalani.com.br/blog

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