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Interface "broken" after exiting WPA_Supplicant / (Ubuntu 10.04 - Atheros AR5001X+)

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http://ubuntuforums.org – Hello, I am very new to Linux, but i want to learn it :-) I have a problem with my wlan0 interface after exiting WPA_Supplicant with ^C. The Interface seems to be broken..... The first connection with WPA_Supplicant works like a charm, i can surf the web, access SSH by another PC and do all the Internet things :-) After exiting WPA_Supplicant, i cant bring the interface UP again with ifconfig. I can't reconnect with WPA_Supplicant. I do not use any GUI or the xwindow system. I'll do all on the Console. Ifconfig gives following output : Code: SIOCSIFFLAGS: Unknown error 132 My WIFI (Hardware)