IronPort Shutdown/Reboot Procedure

                  Shutting Down the Cisco IronPort Appliance

To shut down your Cisco IronPort appliance, use the Shutdown/Suspend page available on the System Administration menu in the GUI

This process is marked as a best practice as in this case the appliance exits Cisco IronPort AsyncOS, which allows to safely power down the appliance.

Cisco IronPort AsyncOS also allows open connections to complete during the delay, after which it forcefully closes open connections.

Restarting the Cisco IronPort Appliance

Restarting the appliance leads to withhold the queue mails before the system is back up without losing any messages in the delivery queue. 

We can also enter a delay for the appliance to shutdown. The default delay is thirty (30) seconds before forcibly closing any existing connections.

After executing either operation the appliance will disallow new connections. It will first try to allow existing connections to close when they are complete and as a last resort will forcibly close connections that still exist beyond the number of seconds you specify below.

Now in case you shutdown the appliance start appliance by pressing the power switch.