To renew the appliance-key use one of the following methods.
In the Management Console, select Configuration > SSL > Appliance Certificates > Request appliance certificate.
In the CLI, enter the following commands:
SG#(config ssl)show ssl keyring appliance-key
This will renew the certificate of the appliance-key for five more years.
Note: A restart is needed for the new appliance certificate to take effect. Until the restart the appliance will use the previous certificate for communication.
Refer 168179 for more details.