authentication is required to set the network proxy used for downloading packages. An application is attempting to perform an action that requires privileges. Authentication as the super user is required to perform this action" and asking for the root password
Step 1: Launch a Terminal Console and type
Step 2: Uncheck PackageKit Update Applet .
See pix below.
Step 1: Disabled /etc/yum/pluginconf.d
# vim /etc/yum/pluginconf.d/refresh-packagekit.conf