My server crashed pretty hard and it took me some time to repair it. But it seems now to be up and running again. I'll try to be careful and look for other hiccups.
Update from 09/05/2019: New Crash. The Hard Drive of the server died. I suspect that was also the cause from the first Crash last month. Hopefully it won't happen again. Hopefully I'll migrate from service provider before the next crash.
[initial post] Woups, the server experienced a pretty hard crash. I'm looking into it. Hopefully it will be up and running back soon.