# Temporal Cloud: Some customers in AWS us-east-1 experienced a small number of gRPC UNIMPLEMENTED errors

- Impact (vendor’s label): none
- Status: resolved
- Started: 2026-05-28 20:22 UTC · Resolved: 2026-05-29 22:14 UTC · Duration: 26 h
- Updates: 7 · Affected components: Amazon Web Services (AWS) - us-east-1, us-east-1
- [Vendor status page: https://stspg.io/8wvm4ldctf4n](https://stspg.io/8wvm4ldctf4n)
- [Company: Temporal Cloud](https://rewindex.com/company/temporal-cloud.md)

## Timeline of updates

- **identified** 2026-05-28 20:22 UTC: Some customers in AWS us-east-1 experienced a small number of gRPC UNIMPLEMENTED errors today from 19:40 to 20:05 UTC.  We have identified a root cause and are currently working towards a permanent fix.
- **monitoring** 2026-05-28 21:00 UTC: The gRPC UNIMPLEMENTED errors previously observed have been mitigated.  We are continuing to monitor the situation and are working towards a permanent fix at this time.
- **monitoring** 2026-05-28 22:14 UTC: Service has remained stable and we are continuing to monitor the situation.  We will continue to provide updates as they become available.
- **monitoring** 2026-05-28 23:17 UTC: We have confirmed the service is now stable and are now working to ensure a permanent fix is in place to prevent any recurrence. We will continue to monitor for errors until the fix is deployed.
- **monitoring** 2026-05-29 02:11 UTC: The service remains stable. We are continuing to monitor closely while work progresses on a permanent fix to prevent recurrence.
- **monitoring** 2026-05-29 10:48 UTC: The service continues to operate normally. We will provide additional updates as they become available.
- **resolved** 2026-05-29 22:14 UTC: The service has remained stable since the initial behavior was observed 5/28 19:40 to 20:05 UTC.  A permanent fix for the region is now in-progress.


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Canonical: https://rewindex.com/company/temporal-cloud/incidents/qj5dg09mtv2y · Markdown: https://rewindex.com/company/temporal-cloud/incidents/qj5dg09mtv2y.md · JSON: https://rewindex.com/api/v1/companies/temporal-cloud/incidents/qj5dg09mtv2y · Generated 2026-10-18T12:20:50.792Z