Sometimes you may see the Virt Manager for Fedora 16 stuck at the state connecting.

To fix this, first stop the libvirtd service.

# systemctld stop libvirtd.service

Then in a terminal, run

# ps -ef | grep libvirtd

You will see a few libvirtd processes running. Kill all the processes in one go using this:

# kill `pidof libvirtd`

Restart libvirt

# systemctl start libvirtd.service

Close and reopen your Virt Manager. You should be able to connect now.