Insufficient privileges in NetworkManager with xmonad

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http://unix.stackexchange.com – I have problem with Network Manager in xmonad. Let's say I want to connect to a new wireless network. When I try to do so, error is displayed, saying: "insufficient privileges". But when I try do do this with Gnome 3 there is no problem. And, when new network is added (using Gnome), I can now connect to this network when I am using xmonad. I use Debian Sid, with 3.2.0-1-486 kernel, latest (0.10) version of xmonad. In xmonad, I use NetworkManager applet ( Part of my .xsession: gnome-screensaver & gnome-settings-daemon & if [ -x /usr/bin/nm-applet ] ; then nm-applet --sm- (HowTos)