centos7 vnc登陆报Authentication is required to set the network proxy used for downloading packages

gui可以用下面命令取消 “PackageKit Update Applet”. 就可以解決了

# gnome-session-properties

如果不需要gui自动更新，卸载最省事

# which gpk-update-icon
/usr/bin/gpk-update-icon
# rpm -qf /usr/bin/gpk-update-icon
gnome-packagekit-2.28.3-3.el6.x86_64
# rpm -e gnome-packagekit