I build a ubuntu server 17.04 with a tutorials yours, and it works fine, only that the sites created in the server only work in the own browser of this computer, because if you try to open in another browser on another pc, it does not work, and in another intranet network , also does not work. I liked to publish my server on the intranet, Anyone who can help me, please ..
What do I have to configure for sure? if I have to configure some port or if I have to by some port forward. I have a firewall that tries to access 192.168 ... through lan it does not let it run over Ethernet
Have You tested the website like this document explains: https://serverfault.com/questions/500329/testing-vhost-config#500335 You can read up on Name Based Virtual Hosts, the usual way ISPConfig creates websites is vhost, which is one of those. https://en.wikipedia.org/wiki/Virtual_hosting
Intranet? Edit host file for each pc to point to your server lan IP. That's it. For internet, it is as replied above.