I'm no expert on wireless security so perhaps someone else can answer on this but from looking at the man page of wpa_supplicant.conf (http://linux.die.net/man/5/wpa_supplicant.conf) and the knetworkmanager program there seems to be a difference between using security with WPA-EAP (as you do on plasmoid) and IEEE8021X (used on NM-APPLET).
I don't think there are any support in plasmoid to configure the connection to use IEEE8021X so that may be the reason why it doesn't work for you.
I'm no expert on wireless security so perhaps someone else can answer on this but from looking at the man page of wpa_supplicant.conf (http:// linux.die. net/man/ 5/wpa_supplican t.conf) and the knetworkmanager program there seems to be a difference between using security with WPA-EAP (as you do on plasmoid) and IEEE8021X (used on NM-APPLET).
I don't think there are any support in plasmoid to configure the connection to use IEEE8021X so that may be the reason why it doesn't work for you.