If you ran the code in the zip file and still get the problem then that makes me think it’s network related, so it could be that you have a firewall blocking traffic on specific ports or that SC is using a different port than expected. When you run FoxDot.start in SC it will say something like:
Listening for messages from FoxDot
-> FoxDot
booting server 'localhost' on address: 127.0.0.1:57110
Can you confirm the address shown on your own machine?