Opc A&E path|Classic OPC: DA, A&E, HDA, XML-DA, etc.|Forum|OPC Foundation

Type typeServer = Type.GetTypeFromProgID("OPCAEServer", "localhost");
string serverUrl = typeServer.GUID.ToString();

Opc.Ae.Server server = new Opc.Ae.Server(fact, null);

Opc.URL url = new Opc.URL(serverUrl);

server.Connect(url, new Opc.ConnectData(new System.Net.NetworkCredential()));

Exception

ExternalException: CoCreateInstanceEx: The server threw an exception.

Opc.ConnectFailedException: 'E_NETWORK_ERROR
Could not connect to server.'

1. path to connect Opc.Ae.Server