It is probably well known from all those who use Plesk on a daily base, I instead use it rarely and I have a minimum knowledge of what functionalities it has. My company has rented a virtual server from a Hosting Provider, and as most of them do, they install Plesk by default on these servers probably to avoid millions of phone calls from unexpert users like me.
It is normal for a company own more than one domain (.it, .com, .net, .eu) and more, each mapped on the company’s site and obviously we don’t make a copy of the site for each domain, or it will be depressing to keep them updated.
In my case, the website has been created with DotNetNuke, which is so nice to allow not only the mapping of more domains on a single portal, but also, to make more portals on the same DNN.
When you open Plesk Administration console, and you want to create the secondary domains the thing that comes to my mind first is click on New Domain, bu that option has only 3 possibilities, Fisical Domain, Forward, Frame Forward, and it is not what we need for the use with our DNN.
What we have to do is click on the Domain that holds fisically the DNN and then use the Add Domain Alias option. This Creates an Alias on the Webserver, mapped on the same Website, it’s an operation very quick, just write the domain alias name and check the Web checkbox, then save.
Done this, you have just to open the DNN using the Host user and map the new domains as portal aliases on any DNN Portal you like.