Where can you change the default Winbox port on a router?

The correct choice is indeed to change the default Winbox port through the specific service settings of the router's configuration. By navigating to "/ip service," you can find a list of services that are running on your MikroTik router, including the Winbox service.

In this context, the option to change the Winbox port explicitly allows you to designate which port Winbox listens on for incoming connections. By default, this port is typically set to 8291. However, for security reasons or to meet specific networking needs, you might want to change this to another port number.

By using the command associated with "/ip service," you can modify the port number directly, ensuring that your Winbox client will connect to the desired port correctly. This approach provides a straightforward method of managing service ports all in one place.