Our upstream provider confirms the cause was a problem with router infrastructure in the datacenter. All systems are operational for now but we keep monitoring the situation.
Posted Sep 01, 2015 - 20:36 CEST
Update
Everything looks ok now.
Posted Sep 01, 2015 - 20:35 CEST
Monitoring
Some accounts were unavailable for a short time. The problem was situated at a network provider upstream. Everything seems back to normal now, we keep on monitoring the situation