Hi,
If you do not configure and enable the Network module, it will happen every time you reboot the server. The goal of that command is to allow you access to the Zentyal Admin Interface so you can configure and enable the Network module.
NOTE: Be cautious with the firewall configuration, you may block the access. If that happens run the command: sudo zs firewall stop.
In case of an issue during the configuration, try to detail it to me as much as possible. Also, remember that you have available the log file '/var/log/zentyal/zentyal.log'. There you will see any error with Zentyal.
--
“This world is ours, and by the Holy Light we will keep it safe, now and forever".