During an outage, our top priority is always getting the site back up and running. While we cannot go into specifics on each attack in order to maintain OPSEC and not tip off the attackers, we can say that each individual attack has been using different IP addresses and targeting different aspects of the site. Initially, we were able to detect and mitigate the attacks before any performance degradation could be noticed, but the latest attacks ramped up very quickly and the site was brought down before we could react.
In each incident, the attacker(s) have been changing their methodology and responding to our countermeasures.
For the past month, Stack Overflow has been hit by weekly DDoS attacks that progressively grew in size and scope.
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