29/10/2025
Incident Start Time 09.08 BST
Incident End Time 09:28 BST
Issue Summary:
On Monday, October 20, a major outage in Amazon Web Services (AWS) US-EAST-1 affected multiple global services. As a result, Amplience Content Delivery experienced elevated 5xx errors, which prevented some content from displaying on customer websites.
AWS declared their incident at 08:11 BST. However, because our infrastructure is designed with caching and resiliency in mind, the impact to customers was initially delayed. Cached content continued to serve successfully until we saw elevated errors at 09:08 BST.
Our engineers promptly redirected traffic away from the affected AWS region, distributing it across multiple healthy regions to restore service stability. We saw this subside at 09:28 BST.
In addition to the direct impact on our services, several third-party platforms we rely on were also affected by the AWS outage. This temporarily limited our ability to share updates as quickly as usual, and we experienced delays in our Video Transcoding service.
Root Cause:
AWS later confirmed the root cause was a DNS resolution failure in their DynamoDB service, which disrupted downstream services hosted in the US-EAST-1 region.
You can view AWS’s official summary here: https://aws.amazon.com/fr/message/101925/
Corrective Actions:
21/10/2025
We understand that many of you are keen to receive our postmortem report. To ensure we provide a complete and transparent account, we need to allow AWS to complete their investigation and share their RCA. Once received, we’ll incorporate their findings into our own review, identify any actions we can take moving forward, and publish the report as soon as it’s available.
During the incident, we communicated that traffic had been routed away from the affected region. As part of our post-incident actions, we have since redirected traffic back to the original region and are not observing any ongoing issues.