WPA2-PSK with madwifi under Debian Linux

[Bob Alexander]

Dear friends,
I would like to know if this list could help me with the following or 
please be redirected to better alternatives.

I have an AP at home (ZyXEL G560) which is configured with WPA2-PSK. 
Under Windows XP (with a patch) my Thinkpad T42 with an atheros based 
wifi b/g card works very well.

Under Linux (Kanotix which is derived from Debian unstable) with 
wpa_supplicant I get associated but after a few seconds get disconnected 
with a neverending cycle of searching, 4way handshakes etc etc (I a 
using the atheros madwifi driver).

Is this a known problem ? I googled A LOT without finding anything 
specific about WPA2, madwifi and wpa_supplicant.

To debug I could provide the wpa_supplicant config, the wpa_supplicant 
command and the resulting (approx 150 lines) debug output.

Thank you for any help offers.

Bob Alexander