I am trying to install 3 domains to point on the same web site. I follow the directives described in the Ispconfig 3.1. I am working on debian 9 witn Nginx server and i have three domains domain1, domain2, domain3. the parent site is domain1 and i want domain2 and domain3 to point on the main site domain1. Nothing works up to now. Whatever the type of redirection, domain2 and domain3 do not point to the parent site domain1. So what to do ? Please help.