by mistake one of support person pressed control Alt delete soft button on VMware guest web console and guest invoked reboot. this was a RedHat guest.
can this be avoided from VMware VCenter end.
I got to know this can be eliminated from RedHat OS by setting up /etc/init/control-alt-delete.conf file.
but I'm searching solution from VMware end as we have more than 500 RedHat guests.
note: vSphere Client version 7.0.2.00500