In Windows, the firewall is switched on by default. To work with Natural, you have to allow Natural to communicate through the firewall. If you do not allow this, it is not possible to start Natural.

You can easily allow the communication through the firewall when you start a Natural component for the first time. In this case, a firewall warning will occur. You just have to accept this warning in order to allow this Natural component.

For detailed information on configuring the Windows firewall, see the Microsoft documentation.