Multi Domain Kentico MVC, error in admin

Dear sirs,

We are developing a multi domain solution using Kentico v12.0.51 MVC. In more detail, we have set up our three different domains as three separate Kentico sites. (In our development environment the domain names are dev.domain1.com, dev.domain2.com and dev.domain3.com). In IIS we have a single web application / single application pool targeting the MVC application folder and setup the three domain names as different bindings.Everything works fine as far as the three web sites are concerned.

The problem we are facing relates to the setup of the administration platform (Kentico admin). We have chosen to setup the Kentico admin as a separate web site is IIS. This is our preferable solution because in the production environment the admin tool may be located in a separate server behind a firewall. In order to achieve this we introduced a new domain name: dev-cms.domain1.com and in Kentico we have set it up as an alias of the first domain (dev.domain1.com). In IIS we created a new web site and added this domain name as a binding. Now we may access the admin tool with the url: dev-cms.domain1.com. The problem is that each time we select a (Kentico) site that we need to manage from the drop down list on the top left in Kentico admin, if we navigate to a domain other that the domain1.com, we get a 404 page. The requested by the admin page has a url like: [domain]/admin, where domain is dev.domain2.com or dev.domain3.com depending on the selected Kentico site.

Please provide us with a solution to this problem.

Thanks in advance,

George