Changelog
Continuing with the redesign of ports and services.
Now nmap returns the real version of the services that are behind the ports, this means that if nmap shows an open port whose version is 'unknown' it is because behind the port it has no active service or the machine is off or any other problem with the service.
Therefore when you configure a port on the router, you will know that it is configured correctly if after making an nmap to the router it shows you the port that you have opened with the service version.