Amazon Web Services incident
Service impact: Inaccurate Estimated Billing Data
Amazon Web Services experienced a minor incident on July 17, 2026 affecting AWS Status, lasting 17h 4m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- monitoring May 22, 2026, 11:38 PM UTC
We are investigating increased error rates for Route53 API calls.
- monitoring May 22, 2026, 11:39 PM UTC
We are investigating increased error rates for Route53 API calls.
- monitoring Jul 16, 2026, 10:18 AM UTC
We continue working to resolve the increased 5xx errors for CloudFront customers utilizing VPC Origins connectivity. Customers utilizing other origin types remain unaffected by this issue. Based on our investigation, we believe the root cause is related to a packet processing subsystem responsible for routing requests from CloudFront's edge locations to resources within customer VPCs. We continue to recommend that customers who are able to do so temporarily change their origin type to resolve the errors. We will provide another update by 4:15 AM PDT, or sooner if additional information becomes available.
- monitoring Jul 16, 2026, 11:16 AM UTC
We continue working to resolve the increased 5xx errors for CloudFront customers utilizing VPC Origins connectivity. Customers utilizing other origin types remain unaffected by this issue. We have further scoped the issue down to routing table capacity within the packet processing subsystem responsible for routing requests from CloudFront's edge locations to resources within customer VPCs. We have identified and are currently testing a mitigation strategy to resolve the issue. Once testing is complete, we will deploy the mitigation in a phased approach. Based on the results from these tests, we will provide a clearer estimated time for resolution in our next update. We continue to recommend that customers who are able to do so temporarily change their origin type to resolve the errors. We will provide another update by 5:15 AM PDT, or sooner if additional information becomes available.
- monitoring Jul 16, 2026, 11:27 AM UTC
We are seeing initial signs of recovery and continue to work toward full recovery.
- monitoring Jul 16, 2026, 11:57 AM UTC
We continue to see significant signs of recovery as a result of our mitigation efforts, with full recovery expected within the next 45 minutes.
- resolved Jul 16, 2026, 12:21 PM UTC
Between 12:45 AM and 4:18 AM PDT, we experienced increased 5xx errors for CloudFront customers utilizing VPC Origins connectivity. Our engineers were automatically engaged and immediately began investigating the root cause. By 2:57 AM PDT, we identified the root cause of the issue as an internal constraint on the fleet that manages connections to private VPC origins. When this constraint was reached, the system responsible for distributing routing configuration to our network processors failed to load the updated configuration data correctly, affecting routing of VPC Origin connections. At 3:52 AM PDT, we took multiple mitigation actions that led to to full recovery at 4:18 AM PDT. Now that the issue has been mitigated, customers who temporarily changed their origin type can safely revert these changes. Customers utilizing other origin types were not affected by this issue. The issue has been resolved and the service is operating normally.
- monitoring Jul 17, 2026, 08:33 AM UTC
We are investigating issues with Cost Explorer reflecting inaccurate estimated billing data.
- monitoring Jul 17, 2026, 09:07 AM UTC
Beginning on July 16 7:38 PM PDT, we began displaying incorrect estimated billing data in the Billing and Cost Management Console. Our engineering teams are engaged and investigating root cause. We will provide another update by 3:00 AM PDT or sooner if more information becomes available.
- monitoring Jul 17, 2026, 10:03 AM UTC
We continue to work to resolve the issue affecting estimated cost and usage data displayed in the Billing and Cost Management Console. We have identified the root cause as an issue with unit pricing within the estimated billing computation subsystem and we are working on a mitigation. The displayed billing estimates do not reflect actual usage and charges. There are no customer actions required at this time. Once the issue has been mitigated, we expect full resolution to take multiple hours as we work through recomputing the estimated billing data. We will provide another update by 4:00 AM PDT or sooner if more information becomes available.
- monitoring Jul 17, 2026, 10:52 AM UTC
We continue to work to resolve the issue affecting estimated cost and usage data displayed in the Billing and Cost Management Console. As previously shared, we have identified the root cause as an issue with unit pricing within the estimated billing computation subsystem. To prevent further inaccurate billing estimates from being displayed, we have paused estimated billing computations. Customers who are currently seeing normal bill estimates will continue to see those estimates, and customers who are seeing inflated estimates will not see them increase further while we work toward resolution. The displayed billing estimates do not reflect actual usage and charges. We continue to work on fully mitigating the issue. Once the issue has been mitigated, we expect full resolution to take multiple hours as we work through recomputing the estimated billing data. There are no customer actions required at this time. We will provide another update by 5:00 AM PDT or sooner if more information becomes available.
- monitoring Jul 17, 2026, 11:58 AM UTC
We continue to work to resolve the issue affecting estimated cost and usage data displayed in the Billing and Cost Management Console. We are actively working on multiple mitigation paths in parallel. The first path involves reverting to the last known good estimated bill computation. With this approach, customers will only see cost and usage data through July 15, however the inflated cost data will be removed. The second path involves rolling back a recent change to the billing computation subsystem. The displayed billing estimates do not reflect actual usage and charges. There are no customer actions required at this time. Once the issue has been mitigated, we expect full resolution to take multiple hours as we work through recomputing the estimated billing data. We will provide another update by 6:00 AM PDT or sooner if more information becomes available.