Update for all who are interested: WLAN between my iLiad and the AP at home works again. I did not change anything at either side. All I can assume is this: connecting to an unsecured WLAN at work might have reset something? Or being powered off during the night? I know, it sounds unlikely but I have no other explanation.
I tried four hours last night. The AP was okay, cause I could use my notebook. I did not change anything at the AP. I am using the same profile on the iLiad which refused to work last night (I did all my attemps to fix it on freshly created profiles, other than re-entering the WEP key in the original profile).
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