OPC Datahub DataSim & DataPID connection error

i got an error while playing around with my OPC Datahub in my virtual machine. DataSim and DataPID simulate OPC data so that u can toy around. if u look at the status - it either shows "Fail to Connect" or "ECONNREFUSED"

thanks to the folk at Software Toolbox - the problem solved. it's so simple. both program requires tunneling feature of OPC Datahub to be enabled.

cheers