When selecting the "Restart Now" option in the Management Console (Maintenance > System and Disks > Tasks > Restart Now) the ISG proxy does not restart.
This is a known issue that only affects ISG proxy devices.
Resolution: Restart using the CLI or SGAC from Management Center.
abrupt Reboot system abruptly, according to restart settings
regular Reboot system according to restart settings
upgrade Reboot system to start running new image