# MULTIPLESERVICES (us-west-2): Increased API Error Rates

- Provider: [AWS](https://down.guide/aws)
- Level: confirmed
- Impact: Degraded
- lasted 2h 18m
- started 2026-09-03 21:49 UTC
- MULTIPLESERVICES
- us-west-2
- id: DWN-551e2296fe
- Official page: https://health.aws.amazon.com/health/status

## Updates from AWS
### 2026-09-03 21:49 UTC: investigating
Starting at 2:12 PM PDT, we began experiencing increased API error rates for STS and Sign In when using SAML in the US-WEST-2 Region. Our engineering team was automatically engaged at 2:19 PM to begin investigating the root cause. There is no work around available at this time. We will provide another update by 3:30 PM PDT.

### 2026-09-03 22:26 UTC: investigating
We are seeing early signs of recovery and continue to monitor for full recovery. We will provide another update at 4:15 PM, or sooner if we have additional information to share.

### 2026-09-03 23:20 UTC: investigating
We continue to see recovery holding steady for the STS AssumeRoleWithSAML and AssumeRoleWithWebIdentity APIs in the US-WEST-2 Region. Error rates are now back to pre-event levels, and we continue actively monitoring to confirm full recovery. We will provide another update by 5:15 PM or earlier.

### 2026-09-04 00:07 UTC: investigating
Between 2:12 PM and 3:18 PM PDT, we experienced increased API error rates affecting the STS AssumeRoleWithSAML and AssumeRoleWithWebIdentity APIs in the US-WEST-2 Region. The root cause was determined to be due to an issue with an STS subsystem responsible for communicating with external identity providers. Other AWS Services that rely on these identity federation protocols were also affected. At 3:18 PM, we observed signs of recovery and continued to monitor to ensure stability and full recovery. The issue is resolved and the service is operating normally at this time.

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