Redhat / CentOS 6 "Authentication is required"

狀況：
使用 VNC 遠端登入，不斷彈出對話框 Authentication is required to set the network proxy used for downloading packages

解法：
# 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-2.28.3-3.el6.x86_64