require an external dojo module not working when loaded from a javascript update site

Dear All,
we have written a extension for CCM and load this as an updatesite in CCM.
Registering and starting the update site is working. New functions like menu items and new buttons are available in CCM.

Where we have problem is with the Dojo "require" command if the module we request is NOT inside the update side deployed but on an external webserver (same IHS webserver than the jazz server is behind).

Following code is not working. There is no error message seen:

require(
{  packages: [
                    {  name: "popup"
                        location: "https://localhost/projects/randomgenerator",
                        main: "popup"
                    }
                ]
            },
            [ "popup" ],
            function(Popup) {
                var popup = new Popup();
                popup.say();
            }
        );

This is working if I run the whole stuff outside jazz. So Dojo do not have an issue with loading modules which are not stored under his baseurl but on a remote webserver.

If I store the module inside the updatesite so it is loaded below the baseurl of Dojo, all is working.

I have also tried adding the URL to the whitelist of CCM, but this has not helped.

Any idea how I can bring Jazz-Dojo to load my external modules?

regards
Guido