NethServer Version: 7.3
When you create a virtualhost, you can set several FQDN domain name to reach your web content and You have a check box to create the dns zone. No problem with that all is right.
When the virtualhost has been created, you can still modify the FQDN, but you have no more the option to create the dns zone....furthermore, if you modify a FQDN, it is not removed from the /etc/hosts and the new one is not added of course.
I think it is a bug....or maybe an unwanted feature.