We've now resolved the incident.
Post Mortem: Our whole EU region was down between 16:08 and 16:30 Berlin time including our own Apps and all client (Uni and Pro) Apps in that region. This was due to human error while adjusting network settings for the region. The network settings had to be adjusted, because of ongoing fraudulent activities.
Thanks for your patience and sorry for the inconvenience.
We think to have fixed the issue and are now monitoring the situation.
All fortrabbit hosted Apps in EU, including fortrabbit websites are currently down. We assume this is a network related issue.