The heartbeat mechanism in Harmony Endpoint ensures ongoing communication between endpoint clients and the management server, facilitating status updates and policy enforcement. TheCheck Point Harmony Endpoint Server Administration Guide R81.20clarifies the timing of this process.

Onpage 27, under "Client to Server Communication," the guide notes:

"The client is always the initiator of the connections. Most communication is over HTTPS (TCP/443), including Policy downloads and Heartbeat."

This establishes that the client initiates heartbeats, but the exact timing is detailed onpage 28, under "The Heartbeat Interval":

"Endpoint clients send 'heartbeat' messages to the Endpoint Security Management Server to check the connectivity status and report updates."

Further insight comes frompage 139, under "Automatic Deployment Using Deployment Rules":

"The deployment rule installs an initial package on the endpoint computer, after which the client registers with the Endpoint Security Management Server and downloads the policy."

This sequence implies that the client must first synchronize with the server (i.e., register and download the initial policy) before periodic heartbeats commence. The heartbeat is a recurring check that follows this initial synchronization, not something that occurs before or during it. Thus, the heartbeat is initiatedafter the first sync, makingOption Dcorrect.

Evaluating the alternatives:

Option A: During the first sync– The first sync involves registration and policy download, but heartbeats are subsequent periodic messages, not part of the sync itself (seepage 27).

Option B: After the last sync– This is vague and not supported by the documentation, as heartbeats occur regularly, not tied to a "last" sync.

Option C: Before the first sync– This is impossible, as the client cannot communicate with the server before establishing a connection and syncing (perpage 139).

Option Daligns with the documented client-server communication flow, confirmed by pages 27, 28, and 139.