We want to elaborate on the challenges we had with networking in our Amsterdam data centre last weekend. 

We unfortunately were the victim of multiple, extremely large distributed denial of service (DDoS) attacks which affected networking availability in the NL-AMS1 data centre. This attack began on Friday afternoon UTC and lasted until Monday morning with intermittent pauses.

This attack was unprecendented in size and breadth as it targeted hundreds of different IPv4 addresses in the data centre. We monitored and mitigated this attack with our upstream connectivity providers.

We worked through the weekend in mitigating these attacks, as our previous approaches were ineffective due to sheer size and breadth of the attack. While we can’t publicly comment on the exact size, we can say it was in the hundreds of Gbps. 

We have communicated in detail to the customers in the NL-AMS1 data centre about the incident, but do not want to highlight specific details in public.  

Please note, we take these attacks as a form of cyber terrorism and we will also be reporting them to the Dutch and Finnish cyber security officials. We are taking more steps with our partners in building resilience to mitigate these attacks in a technical manner.

We sincerely apologise for the issues in network connectivity and thank you for your understanding.