mac os x server profilemanager is not available outside the local network

Hi,

I have some trouble using the profilemanager. Planed is to install the server for configuring and supporting our iPhone user

Its a mac mini with OS X Server installed. I've just activated the Websites, OpenDirectory and Profilemanager service. I added the Server to our AD and I'am able to choose the User to allow them to log on to the profilmanager. No problems so far.

But then I added a port forwarding to our firewall with this ports -> http://support.apple.com/kb/HT5302?viewlocale=de_DE to the server.

Then I logged on to a external client pc and opened the url forwarded to our ip. The first website with the server logo I got. But if i try to open a subfolder like /profilemanager I get only a white screen without any content. Just a title "Admin" is shown in the browser tab.

Then I tried it with a local client. This client located in the same IP range can open the subfolders without any problems.

Whats the problem here? Just a parameter in the server config that tells him to deny connections from external?

Marcel