Language discover isn´t possible - got a red X instead

When I press on the "discover" button inside the Komento control panel i got a "Retrieving list of languages ..." and then a Red X.

For other components I can install and update the latest language pack, however not for Komento...

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Note on my private Komento installation covered by another support contract I couldn´t reproduce that issue. So it looks like its something specified to that installation / server.