The OPC Systems Service communicates with other OPC Systems Services and .NET components through .NET Remoting so networking has never been easier. The default TCP port number that OPC Systems.NET uses is 58724. If you have a firewall simply add this port number in the exceptions list. The TCP port is adjustable using the Configure OPC Systems application under Configure-Options as the WCF Port Number. You can also set the WCFPortNumber property in all .NET controls.
To add a port to the exceptions list select Control Panel-Windows Firewall, then the Exceptions Tab. Use the Add Port button to add the TCP Port 58724. Use the Change scope button to specify the range of security for the port number.
For remote connections you can either use a Network Node name, IP Address, or registered Internet domain name of the remote nodes.