Controls whether SSG generates a notification when it detects that a RADIUS client has rebooted. This gives operations visibility into an event that otherwise looks like a burst of session failures with no obvious cause: a NAS reboot invalidates its in-flight sessions, and without this notification an admin has to infer the reboot from a spike in failed sessions rather than being told directly. A NOC monitoring for infrastructure flaps would enable cssgCfgRadiusClntRbtNotifEnabled so a remote access concentrator's power-cycle raises an immediate alert instead of only showing up later as an unexplained cluster of dropped sessions.