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If you hit CTRL-ALT-DEL on ESX 4 console, the server will reboot instantly, it doesn't matter if the server is not in Maintenance Mode.

To disable this, add the following to your kickstart file :

# Remove dangerous default of ctrl-alt-del from inittab
sed -e ’s/ca::ctrlaltdel/# ca::ctrlaltdel yes/’ /etc/inittab > /etc/inittab.new
mv -f /etc/inittab.new /etc/inittab
init q