Hello everyone
I created a second topic since this is unrelated to the first one.
I set up an environment inside a Linux VM in Azure.
config.yml is as follows:
ACTIVATE_HTTPS: true
ACTIVATE_NOTES: false
ACTIVATE_XQUEUE: true
CMS_HOST: studio.edx.leex.ch
CONTACT_EMAIL: contact@leex.ch
ID: dWkYQGyq
LANGUAGE_CODE: en
LMS_HOST: edx.leex.ch
PLATFORM_NAME: My Open edX
I’ve omitted some of the secret stuff 
Now, problem is, for some reason the login into the cms doesn’t work.
By which I mean, that I try to sign into the CMS, get forwarded to the LMS Login system (correct behavior as of Ironwood I think), enter my credentials, but when i then get directed back to the CMS, i’m not logged in.
Once I go back to the LMS, i’m logged in though.
This didn’t happen in an instance, where I had SSL-Encryption not enabled.
Do you know what might cause this problem, and how I might fix it?
If you need access to monkey around, i can provide you with one, since this is only a test enviroment.