Resolved after 1 hour 33 minutes, affecting US-West, on February 27, 2026.
### **Dates:** Friday, February 27th 2026, 16:15 UTC - 19:50 UTC ### **What happened:** Requests made using API client authentication would return 500 errors. ### **Why it happened:** An internal data structure became corrupted due to a race condition. ### **How we fixed it:** The affected service was restarted, and a long-term fix was applied. ### **What we are doing to prevent it from happening again:** Thread locking has been applied to the affected service.
Affected components
Update timeline
- investigating Feb 27, 2026, 06:42 PM UTC
Live and automated real device test results are not being displayed on the test results page in the US-West-1 data center. We are investigating.
- resolved Feb 27, 2026, 08:15 PM UTC
After taking remedial action, we are now seeing real device test results display in the US-West-1 data center. All services are fully operational.
- postmortem Apr 15, 2026, 07:06 PM UTC
### **Dates:** Friday, February 27th 2026, 16:15 UTC - 19:50 UTC ### **What happened:** Requests made using API client authentication would return 500 errors. ### **Why it happened:** An internal data structure became corrupted due to a race condition. ### **How we fixed it:** The affected service was restarted, and a long-term fix was applied. ### **What we are doing to prevent it from happening again:** Thread locking has been applied to the affected service.
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Amazon Web Services