The port is only needed if your ctrlX COREvirtual is running in port forwarding mode because, like the name already says, the communication is routed via these ports. Then your IP should look like on my picture above: 127.0.0.1:8740. Please add this by hand. The drop down menu just shows the already insert values.
When the ctrlX COREvirtual is running in network adapter mode the needed IP is just the IP of the control (e.g. 192.168.1.1) without the port because an windows network adapter is used.
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