Assuming that heartbeats are sent both ways for machine availability, the server end is slow to recognize a computer is offline. This can make testing things like Wake on LAN very slow. If the client agent can somehow notify the server that a shutdown event was recorded and update the portal much sooner that would save a lot of time. Alternatively, decrease heartbeat interval times? Sometimes have to wait 5-10 minutes after shutting down a machine before the portal recognizes the device is offline.