Resolved after 4 hours 45 minutes, affecting N. Virginia, USA (us-east-1), on June 10, 2025.
A routine system maintenance operation at the OS level led to the application of system updates across multiple EC2 instances in our clusters in several AWS regions. These updates included changes to networking components, which inadvertently triggered restarts. As a result, several EC2 nodes failed health checks and temporarily dropped out of the cluster, disrupting high availability and causing partial connectivity issues for some clients and operations. We have since reproduced the issue in a controlled environment and verified the root cause. To prevent a recurrence, we are updating our node maintenance strategy to ensure greater control over the timing and impact of system-level changes and excluding networking components from automated upgrades.
Affected components
Update timeline
- investigating Jun 10, 2025, 07:23 AM UTC
We are currently investigating this issue.
- monitoring Jun 10, 2025, 07:45 AM UTC
A fix has been implemented and we are monitoring the results.
- resolved Jun 10, 2025, 12:08 PM UTC
This incident has been resolved.
- postmortem Jun 11, 2025, 11:37 AM UTC
A routine system maintenance operation at the OS level led to the application of system updates across multiple EC2 instances in our clusters in several AWS regions. These updates included changes to networking components, which inadvertently triggered restarts. As a result, several EC2 nodes failed health checks and temporarily dropped out of the cluster, disrupting high availability and causing partial connectivity issues for some clients and operations. We have since reproduced the issue in a controlled environment and verified the root cause. To prevent a recurrence, we are updating our node maintenance strategy to ensure greater control over the timing and impact of system-level changes and excluding networking components from automated upgrades.
Your product runs on more than Upstash
Add the vendors you depend on and get one message when any of them reports trouble. Free for 3 vendors, no card.
Amazon Web Services