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I didn't succeed in finding how to configure gnome 3 system proxy settings. I didn't find it in the Preferences (It was in Menu Applications -> Preferences -> Netowrk Proxy in former Fedora/gnome 2 ) Googling, I came across this link : http://blogs.gnome.org/hughsie/2010/12/16/gnome-3-and-the-network-control-panel/ But I can't see a Network Proxy tab or button in network preferences.
It's in the network preferences, which is enabled in control-center-2.91.91-3.fc15 and later.