I've got a trick to solve the problem. 
Just kill NetworkManager with sudo killall nm-applet, press Alt+F2 and type 
nm-applet, now the connection should work!

Tell me if it works even for you

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[Intrepid] iwl3945 + iwl4965 -- network-manager will not connect to a WPA 
Enterprise network (disassociating by local choice (reason=3) )
https://bugs.launchpad.net/bugs/272185
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