There are several bugzilla reports concerning yumex / similar errors to yours. I have an F18 box running but I'm not at that desktop. Using SSH I logged in and installed yumex. Then I logged out and logged back in to try yumex remotely.
PHP Code:
ssh -X glenn@enterprise
yumex
Got this:
PHP Code:
05:15:14 : INFO - Starting yum child process
05:15:15 : INFO - YUM: Error executing command as another user: Not authorized
05:15:19 : ERROR - ERROR: Fatal Error : backend-not-running
05:15:19 : ERROR - ERROR: Could not get polkit autherisation to start backend
Yum Extender will terminate
05:15:19 : INFO - yum backend process is ended
05:15:19 : INFO - yum backend process is ended
Program Terminated
Then I switched to root.
PHP Code:
su -
<password>
yumex
Ran yumex again with the --root switch as suggested in some of the bugzilla reports.
Yumex then worked perfectly.
This is not the way it should be and is not a proper solution. I guess my point is that there are several bugzilla reports about yumex. Those that I've read don't seem to offer a permanent solution, just workarounds.