Resolved after 4 hours 22 minutes, affecting US-East and US-East and 1 more, on June 1, 2026.
### **Dates:** Monday, June 1st 2026, 13:06 UTC - 15:42 UTC. ### **What happened:** Customers served by the US-EAST-4 region were unable to authenticate or start new test sessions because an incomplete TLS certificate chain was deployed to the core directory services. ### **Why it happened:** A certificate extraction script defect silently truncated the certificate chain after the certificate authority transitioned to a longer hierarchy. ### **How we fixed it:** Reverted the certificate rotation and re-applied the previous known ,good certificate to restore authentication services. ### **What we are doing to prevent it from happening again:** Implementing pre-deployment certificate chain validation, adding active monitoring, and fixing the script's chain-length limitations.
Affected components
Update timeline
- investigating Jun 01, 2026, 02:02 PM UTC
We are experiencing an issue where the US-EAST data center is currently unavailable. We are investigating.
- investigating Jun 01, 2026, 02:55 PM UTC
We are continuing to investigate this issue.
- investigating Jun 01, 2026, 03:30 PM UTC
We have identified the root cause and are working on implementing a fix.
- monitoring Jun 01, 2026, 04:02 PM UTC
Access has been restored to the US-EAST data center. We are monitoring.
- resolved Jun 01, 2026, 06:24 PM UTC
After taking remedial action, access to the US-EAST data center is fully restored. This incident is resolved.
- postmortem Jun 15, 2026, 11:32 PM UTC
### **Dates:** Monday, June 1st 2026, 13:06 UTC - 15:42 UTC. ### **What happened:** Customers served by the US-EAST-4 region were unable to authenticate or start new test sessions because an incomplete TLS certificate chain was deployed to the core directory services. ### **Why it happened:** A certificate extraction script defect silently truncated the certificate chain after the certificate authority transitioned to a longer hierarchy. ### **How we fixed it:** Reverted the certificate rotation and re-applied the previous known ,good certificate to restore authentication services. ### **What we are doing to prevent it from happening again:** Implementing pre-deployment certificate chain validation, adding active monitoring, and fixing the script's chain-length limitations.
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Amazon Web Services