Lock Down Gnome-screensaver

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Hello All,

I’m trying to set defaults for gnome-screensaver on some CentOS6.5
laptops and lock it down with these commands:

# gconftool-2 –direct –config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory –type boolean –set
/apps/gnome-screensaver/lock_enabled true

# gconftool-2 –direct –config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory –type boolean –set
/apps/gnome-screensaver/idle_activation_enabled true

# gconftool-2 –direct –config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory –type int –set
/apps/gnome-screensaver/idle_delay 20

The first two commands work, in the screensaver-preferences window, these settings get grayed-out. But the idle_delay 20 command does not work, users can still change the setting to let’s say 1 minute.

Does anybody know how to do this?

Greetings, J.