# Dagster: Major incident: Cannot launch runs in Serverless

**Summary:** Dagster reported a major API incident preventing Serverless runs from launching, starting 2023-08-03 20:29 UTC and resolved at 2023-08-03 21:23 UTC (53 min). Runs were launching successfully as of 20:50 UTC; Dagster attributed the issue to AWS EC2 API errors and latency affecting AWS Fargate, used by Dagster Cloud Serverless. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2023-08-03 20:29 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/ypf9f69mspmg](https://stspg.io/ypf9f69mspmg)
- [Company: Dagster](https://rewindex.com/company/dagster.md)
- Versions: before (none: first archived) → after incident\_version:141/byv669xztg6c@da7ac5c2714b
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Cannot launch runs in Serverless
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2023-08-03 20:29 UTC
```

**5. Added: Resolved time**

```diff
+ 2023-08-03 21:23 UTC
```

**6. Added: Affected components**

```diff
+ API
```

**7. Added: Update** (investigating) · 2023-08-03 20:29 UTC

```diff
+ We are currently investigating this issue.
```

**8. Added: Update** (monitoring) · 2023-08-03 21:09 UTC

```diff
+ We are seeing runs successfully launch as of 20:50 UTC. We are continuing to monitor the situation.
```

**9. Added: Update** (resolved) · 2023-08-03 21:23 UTC

```diff
+ AWS was experiencing increased API error rates and latencies for their EC2 APIs, which impacted AWS services making use of these APIs. This included AWS Fargate, which is used in Dagster Cloud Serverless. Their incident was resolved as of 21:18 UTC.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2023-08-03 20:29 UTC | Major incident: Cannot launch runs in Serverless (this change) | outage |

All Dagster changes: [timeline](https://rewindex.com/company/dagster/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/i00e3f02db5c2ad · Markdown: https://rewindex.com/change/i00e3f02db5c2ad.md · JSON: https://rewindex.com/api/v1/changes/i00e3f02db5c2ad · Generated 2026-10-18T02:55:11.927Z