Hi Folks, I need your help.
I developed a multisite (3 sites) on my local environment, using XAMPP, Joomla 2.5 and Seblod 3.1.4 (from Seblod I am using ONLY the multisite features!).
With the setup of 3 virtual hosts (described here: http://www.seblod.com/v2/documentation/seblod-2x/multi-sites/1835-test-on-local-server.html) everything workes fine.

Now I am trying to get the whole thing running on a "real" webserver, but I am stuck.

The environment:
On "http://mysite.at" there is the actual website running (this is an independant Joomla 2.5 installation and this one should be replaced hopefully some day).

On "http://mysite.at/nextgen/" I setup the project mentioned above (3 sites).
Now I have forwarded "mytry.org" to "http://mysite.at/nextgen/" in the configuration panel of my domain-hosting.
In one of my sites I changed the URL to "mytry.org".

So what happens:
If I call "mytry.org" in my browser, there pops up a login form, although in all of my sites there is no login form and in the backend it is disabled!
The same happens if I call directly to "http://mysite.at/nextgen/".

If I try to login in (for instance as the superadmin) I am redirected to the error-page.
So I am not able to see any page of my site(s).

For me it seems that the caller (user) is not allowed to see this page(s).
I tried to debug with the Joomla-Debug-Console.
There I found when calling the page "mytry.org" no user is set. Should it not be "public"? Or should "no user" be automatically "public"?

Is the setup correct, or do I have to redirect to whatever? Do I have to redirect in htaccess to whatever?

(Login to the backend with the URL "http://mysite.at/nextgen/administrator/" and as superadmin is possible).

So any ideas are appreciated,
thank you, Michael