The heartbeat service uses an ICMP ping to test for the online status of computers. You can verify Admin Arsenal by using a ping tool, such as ping.exe which comes with Windows. There are a number of reasons why a ping may not see a computer:


•Firewall on the computer.
•Routers blocking pings or are misconfigured.
•High latency on the network connection.
•Misconfigured network on the target computer.