NetGear MA111 WEP128 Linux-WLAN

Hello *,

I want to use WEP128 on NetGear MA111 (sharedkey, infrastructur mode)
with linux-wlan project and slackware. Has someone running MA111 with
WEP128?
I am interested in a config file '/etc/wlan/wlancfg-xxx' with
wep-encryption enabled and a rc.local or wlan script.
Everytime iwconfig tells me 'Encryption keyff'. :-((
LED on access point flashs short if LED on USB adapter flashs, so I
think USB adapter has a connection to AP, but WEP does not work.

Thanks,

Sven