Thank you for your quick reply. Yes I tried to reboot several times. I reinstalled the widget. For this I activated the auto-connect-feature for WiFi, because I don't know how to set up a connection without the button in the system menu. After a second reboot, the connection window appears and the n900 searchs for available connections, but can not find any. It is curious because nor UMTS/GPRS either my dummy-connection is available.