Somehow that was a hosting provider issue…
My vps was not able to connect or ping anything google related… and somehow this affects discourse…
They fixed it now, and everything works perfectly! 
Crazy stuff. huh…
It did not fail due to internet connectivity… Everything worked fine… Just google blocked my vps ip for some reason. That should definitely not transfer to 502 error on /admin/docker/latest?path=all… but it did ^^