I was able to get this resolved by creating a custom rule in the widows firewall. I used the following documentation to do this: https://coderwall.com/p/mbov6w/running-nodejs-and-express-on-windows
Also make sure that the project is running on port 8080. I experienced conflicts when using a custom port.
I had the same problem and get this answer from Mendix :
Can you check the firewall settings and ensure that the Node.js entries in Inbound Rules are enabled for the Modeler versions being used?
You should be able to see the version number listed in the Program column (8.8.1.4465):
The public one was blocked indeed. It was solved after allow this public one.