AHeidrich

first arg for open_client is the server name, not the IP address - I guess. did u try to use "Matrikon.OPC.Simulation" instead of the IP address. optionally followed by the ip/dns-name of the server-host, if it isn't the same as the gateway. tbh it doesn't perfectly work for me either, only if I install Matrikon test server on the gateway machine as well. If I install OPC server on the gateway machine as well, I can connect / read both servers through the gateway.

opc returns unspecified error