The heartbeat message is sent once every 24 hours.
The first message is sent when it is first restarted and the next message is sent 24 hours later. The message contains statistical and configuration information for the ProxySG appliance as well as health information. Heartbeats are commonly sent to system administrators and the heartbeat server in Blue Coat.
Note: Heartbeats do not contain private information; they include statistics useful for pre-emptively diagnosing support issues.