I have a Cisco PIX Firewall 535 Version 6.3(4) and we have been having problems with this firewall restarting. It is being managed by DFM 3.0.3. We have not received a single alert or email in regards to this device. We have been shutting down and powering on this device the last couple of hours and not one alert has came in. Could someone please advise as to what I need to do?