Amazon Identifies Cause of May 2026 AWS Outage as Thermal Event

AWS Outage Overview

Amazon Web Services (AWS) recently provided an explanation for the outage that disrupted several major websites and applications in May 2026. The outage, which lasted from Thursday to Friday, had a significant impact on platforms such as FanDuel and Coinbase, leaving users unable to access services critical for betting and trading during a busy period.

Cause of the Outage

According to a statement released on the official AWS status website, the outage was attributed to a "thermal event," which resulted in a loss of power at a data center located in northern Virginia. In layman’s terms, this means that some equipment overheated, causing a major service disruption.

AWS reported that they shifted traffic away from the affected data center during the late afternoon of Thursday, which was a critical response to mitigate further impact. By early afternoon on Friday, the company managed to restore the cooling systems, thereby facilitating the gradual recovery of services.

Recovery Efforts

Amazon communicated, "Our main effort during the event mitigation strategy was to bring back our cooling systems capacity. By May 8 at 1:50 PM, we stabilized cooling system capacity to pre-event levels, allowing us to restore the majority of the impaired EC2 instances and EBS volumes." However, at the time of their update, a few instances remained impaired, indicating that recovery efforts were still ongoing.

Impact on Users

The outage notably affected users of popular applications such as FanDuel and Coinbase. Many users experienced frustration as they were unable to place bets or trade as they usually would during this period. Fortunately, the majority of services have since been restored, allowing users to resume their activities, including participation in upcoming NBA playoff prop bets.

Conclusion

This incident highlights the vulnerabilities associated with data centers and the critical importance of maintaining reliable cooling systems. Amazon’s swift action in response to the thermal event helped reduce the downtime experienced by users, ensuring most services were back to normal seemingly quickly after the event. Although challenges remain for a small number of instances, AWS continues to work towards full recovery.