This is a TCP Port through a firewall. Enter 0 if you are not using a firewall
If using a Firewall, two TCP Ports are required (you can not specify the same port number for both Primary and Secondary). The TCP Ports used during Installation of the Project Node appear here by default. These are not necessarily the TCP Ports of your SCADA node.
TCP ports are used with a Firewall and are optional. If not using a firewall, leave these fields with the default value (0).
Primary TCP Port = 4592
Secondary TCP Port = 14592
See Primary Port Number for more information.