The creation of certificates seems not to work properly. I'm not sure why, but the csr, crt and key file is not created in the ssl directory.
I had to manually create the files, put them in to the ssl directory, trigger ssl enable event to get the ssl vhost config written.
I also had to anable apache to listen on port 443.
I wasn't sure if apache got restartet, so I did it by hand.
After that I finally can connect through https.
The certificate is not displayed on the ssl tab.
I hope this helps somebody... After playing in a virtual machine, now I can setup https on the "real" machine