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

- Provider: [Temporal Cloud](https://down.guide/providers/temporal-cloud)
- Confidence: Confirmed
- Impact: Degraded
- lasted 1d 1h
- started 2026-05-28 20:22 UTC
- us-east-1
- us, us-east-1
- Temporal Cloud states the impact was 2026-05-28 19:40 to 20:05 UTC (25m)
- id: DWN-9fb8aef4f1
- Official page: https://stspg.io/8wvm4ldctf4n

## Updates from Temporal Cloud
### 2026-05-28 20:22 UTC: identified
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.

### 2026-05-28 21:00 UTC: monitoring
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.

### 2026-05-28 22:14 UTC: monitoring
Service has remained stable and we are continuing to monitor the situation. 
We will continue to provide updates as they become available.

### 2026-05-28 23:17 UTC: monitoring
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.

### 2026-05-29 02:11 UTC: monitoring
The service remains stable. We are continuing to monitor closely while work progresses on a permanent fix to prevent recurrence.

### 2026-05-29 10:48 UTC: monitoring
The service continues to operate normally. We will provide additional updates as they become available.

### 2026-05-29 22:14 UTC: resolved
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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