Amazon reveals the cause of the May 2026 AWS outage

Late in the week, an Amazon Web Services outage affected a range of websites. In the wake of that outage, which lasted from Thursday into Friday, Amazon has revealed what happened.

In an update on the official AWS status website, Amazon revealed that the outage was caused by a "thermal event resulting in a loss of power" at a single data center in northern Virginia. In other words, some tech overheated. This prompted Amazon to shift traffic away from that data center's "Availability Zone" during the late afternoon on Thursday. By early afternoon on Friday, Amazon had managed to restore its cooling systems, which kick-started the process of getting everything back online.

"Our main effort during the event mitigation strategy was to bring back our cooling systems capacity. By May 8 1:50 PM, we were able to stabilize cooling system capacity to pre-event levels, which helped us to restore the majority of the impaired EC2 instances and EBS volumes," Amazon said. "A small number of instances and EBS volumes remain impaired, and we continue to work to recover all affected remaining resources."

The outage affected some popular apps, like FanDuel and Coinbase. Users were unable to bet or trade as they normally would on those apps for a while, likely leading to some consternation on Thursday and Friday. However, the issue seems to be mostly resolved at this point, so you can probably get your NBA playoff prop bets in now, if you so desire.