In your screenshot, there is some blue text under the Port text box that says "Network Interface". That blue text is a link you can click on to change the network interface used when communicating over the network. For instance, if there was a system on your network that has the same IP address as the simulated PMU and is connected to your physical network card, you can select the virtual network interface that is connected to the simulated PMU so that the PMU Connection Tester's IP packets cannot possibly reach the other computer.
There are two things I can infer by the error message you are getting:
- The PMU Connection Tester's IP packets are definitely reaching a device somewhere on your network.
- The device receiving the packets is not listening on the TCP 126.96.36.199:7200 endpoint.
If you insist that your packets cannot possibly be reaching any other device on your network, then the PMU itself must not be listening on the TCP 188.8.131.52:7200 endpoint. I don't know how the OPAL-RT simulator works, but there are two things that would help immensely if you are able to do them.
- Run netstat on the simulated PMU to see whether the device thinks it is, in fact, listening on the TCP 184.108.40.206:7200 endpoint.
- Run a packet capture on the simulated PMU to see whether the PMU Connection Tester's IP packets are, in fact, reaching the PMU and not some other system on your network.