I am trying to setup a server according to these guide: http://www.howtoforge.com/perfect-server-ubuntu-12.04-lts-nginx-bind-dovecot-ispconfig-3-p5 During step "16 Install PureFTPd And Quota" the instructions guide through the installation of an SSL certificate. Why do we need to do this at this point? I prefer to install the ISPConfig3 and then install the SSL certificate through the friendly GUI. What am I missing here please?