Hallo Stefan,
thank you for the hint. Where can you get these detailed informations from?
So far, I don't have an SSL-certificate for my server, so "https://..." does not really make sense. Anyway, I added my server (with "http://...") to the "useCors" settings in "localConfig.js" and restarted mapstore. After adding a new WFS service, the message is "The service is not available. Please check the URL.".
Strangely, when I add "https://..." to "useCors" it says "Success", but still no search results from the new WFS server.
Do you have another idea? Tomorrow I will also try to obtain an SSL certificate from my provider...
Thanks,
Markus