Windows client problem

[Sylvain]

Hi list,

My hostapd AP (with ath9k) works very well as far as I can tell. I get a 
good connection to it from my eee which uses linux and ath5k.

However, I cannot get to connect my wife's laptop which is on windows XP 
and uses an intel chip. It actually goes through endless cycles of 
authentication / dehautentication. When I run hostapd with -dd and no 
wpa, here is what I get:

STA 00:18:de:6c:28:91 sent probe request for our SSID
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT
mgmt::auth
authentication: STA=00:18:de:6c:28:91 auth_alg=0 auth_transaction=1 
status_code=0 wep=0
   New STA
wlan0: STA 00:18:de:6c:28:91 IEEE 802.11: authentication OK (open system)
wlan0: STA 00:18:de:6c:28:91 MLME: 
MLME-AUTHENTICATE.indication(00:18:de:6c:28:91, OPEN_SYSTEM)
wlan0: STA 00:18:de:6c:28:91 MLME: 
MLME-DELETEKEYS.request(00:18:de:6c:28:91)
authentication reply: STA=00:18:de:6c:28:91 auth_alg=0 
auth_transaction=2 resp=0 (IE len=0)
MGMT (TX callback) ACK
mgmt::auth cb
wlan0: STA 00:18:de:6c:28:91 IEEE 802.11: authenticated
MGMT
mgmt::assoc_req
association request: STA=00:18:de:6c:28:91 capab_info=0x401 
listen_interval=10
WME IE - hexdump(len=7): 00 50 f2 02 00 01 00
Validating WME IE: OUI 00:50:f2  OUI type 2  OUI sub-type 0  version 1
handle_assoc STA 00:18:de:6c:28:91 - no HT, num of non-HT stations 1
hostapd_ht_operation_update current operation mode=0x0
hostapd_ht_operation_update new operation mode=0x13 changes=2
   new AID 1
wlan0: STA 00:18:de:6c:28:91 IEEE 802.11: association OK (aid 1)
MGMT (TX callback) ACK
mgmt::assoc_resp cb
wlan0: STA 00:18:de:6c:28:91 IEEE 802.11: associated (aid 1)
wlan0: STA 00:18:de:6c:28:91 MLME: 
MLME-ASSOCIATE.indication(00:18:de:6c:28:91)
wlan0: STA 00:18:de:6c:28:91 MLME: 
MLME-DELETEKEYS.request(00:18:de:6c:28:91)
wlan0: STA 00:18:de:6c:28:91 RADIUS: starting accounting session 
49BBA0DB-00000000
MGMT
mgmt::deauth
deauthentication: STA=00:18:de:6c:28:91 reason_code=1
wlan0: STA 00:18:de:6c:28:91 IEEE 802.11: deauthenticated
wlan0: STA 00:18:de:6c:28:91 MLME: 
MLME-DEAUTHENTICATE.indication(00:18:de:6c:28:91, 1)
wlan0: STA 00:18:de:6c:28:91 MLME: 
MLME-DELETEKEYS.request(00:18:de:6c:28:91)
hostapd_ht_operation_update current operation mode=0x13
hostapd_ht_operation_update new operation mode=0x0 changes=2
unknown vendor specific information element ignored (vendor OUI 00:03:47 
len=7)
STA 00:18:de:6c:28:91 sent probe request for our SSID
MGMT (TX callback) ACK
mgmt::proberesp cb
MGMT
mgmt::auth
authentication: STA=00:18:de:6c:28:91 auth_alg=0 auth_transaction=1 
status_code=0 wep=0

and it goes like this all over and over again.

So, does anybody have any clue of what could cause this problem. For 
instance, what's reason_code=1? Google did not help...

Let me know if you need any more information to figure out what's going 
on. Thank you in advance!

Sylvain