I have solved the problem @robhoutkamp
Change your server to Ubuntu 18.04 + Plesk
Thank me later 🙂
I have tried everything you did. I use plesk with centOS 7 at work and it just works and this doesnt. I have no clue why. I have the same setup at TransIP and it just works as well.
This is a problem on strato’s side. We need to contact the helpdesk.
@robhoutkamp Ik heb hetzelfde exacte probleem. Heb je al een oplossing?