Ping is prohibited in computers firewall in our network. How can I find and monitor remote computers?
Since most hosts in modern networks are protected with firewalls, pinging those hosts regularly may not work out (if ICMP echo replies are disabled). In such cases, checking by opening a TCP connection to a specific port of the host may help out. For example, it is common for local area networks to set up FTP services on users’ computers. In this case, we can check availability of hosts by attempting to connect to their TCP port 21 (FTP), port 139 (NetBios), or port 135 (DCOM).
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