This is broken for me too, and only broke after the May 26 update to NetworkManager (0.8.999-3.git20110526.fc15).  See bug here too:
https://bugzilla.redhat.com/show_bug.cgi?id=708626

It "works" for wifi only if you delete all the things as said below, but if you try adding a VPN connection it breaks again.  It is very fragile :-/  I wasted many hours on Sunday trying to resurrect my laptop.

On Tue, May 31, 2011 at 2:57 PM, Sam Varshavchik <mrsam@courier-mta.com> wrote:
Jingtao writes:

Hello,
     I use yum update -y today, and it update NetworkManager,when I reboot my Fedora 15,I can't connect to Network.
     I open gnome-terminal, press these:

  su
  /etc/init.d/NetworkManager start

     it shows cannot start it.

    When I insert my install CD,and reinstall the old NetworkManager,I can start NetworkManager,and can connect to Network,so what can I do,waiting for next update?

Is this wireless, and did you upgrade from F14?

Remove your existing /etc/sysconfig/network-scripts/ifcfg-Auto_SSID files, and reenter your AP passwords. NetworkManager now puts more stuff in them. If you upgrade from F14 and the new stuff isn't there, NetworkManager craps out with a backtrace in /var/log/messages, either right away, or at some random point in the future.

Also, if you upgraded from F14, you'll need to run "chkconfig rsyslog on" and "service rsyslog start" to actually have something logging into /var/log/messages. rsyslog rpm's scriptlet is broken and won't enable rsyslog in systemd, when updating from F14.



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