Check the firewall on the server & open port

You can do this by running the following command
in a prompt : netsh firewall show portopening

If you get an empty list, no firewall is on,
if you see a list, check that there is a line containing
the correct port : standard it is 21234

To open the port,
run the following command : netsh firewall add portopening TCP 21234 CCNET

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