Hello everyone, this tutorial is very good. Now I have the following problem and I want to know how to solve it. Maybe you need to open any port or set well ISPConfig 3 (not quite understand). Well hire a DYNAMIC DNS service. Say a Public IP (or also a domain) directly to the next machine this tutorial http://www.howtoforge.com/perfect-server-debian-wheezy-apache2-bind-dovecot-ispconfig-3 The thing is that when I write the IP 192.168.0.100 I ACCESS TO ALL FACILITIES. but when you connect the machine to a "PUBLIC IP" or "DOMINIO.COM" I can not access any service. why this happens and how I can solve it if I want to install a dynamic DNS service as "www.no-ip.org"?