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wpa_supplicant not working in CentOS on dell latitude x200

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http://www.linuxquestions.org – Hi forum, Just installed CentOS 5.5 on my dell latitude x200 and am trying to configure my wifi. I believe wpa_supplicant was installed by defualt; I also installed a package with a name like "wpa_supplicant gui" from add/remove programs. I can get on to unsecured wireless networks, but unfortunately, my home network is WPA protected. When I start up CentOS, I get the message "wpa_supplicant failed to initialize". However, when the desktop boots, and I check which services are running, wpa_supplicant is listed as running. When I open networkmanager (HowTos)