# Firebolt: Major incident: Engines may fail to start and stop

**Summary:** Firebolt reported a major incident in which engines could fail to start or stop, beginning 2021-07-20 04:30 UTC and lasting 4 h 20 min. Firebolt attributed it to unidentified issues on AWS’s side and confirmed resolution there at 2021-07-20 08:50 UTC, restoring engine start/stop functionality. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2021-07-20 04:30 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/9wxqg2rpml4x](https://stspg.io/9wxqg2rpml4x)
- [Company: Firebolt](https://rewindex.com/company/firebolt.md)
- Versions: before (none: first archived) → after incident\_version:147/3wqxc2sz6v8b@a0b36da967b7
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Engines may fail to start and stop
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2021-07-20 04:30 UTC
```

**5. Added: Resolved time**

```diff
+ 2021-07-20 08:50 UTC
```

**6. Added: Affected components**

```diff
+ Engines, Firebolt Components - Engines
```

**7. Added: Update** (investigating) · 2021-07-20 04:30 UTC

```diff
+ Engines may fail to start and stop due to unidentified issues on AWS side.
```

**8. Added: Update** (investigating) · 2021-07-20 06:41 UTC

```diff
+ We are continuing to investigate this issue.
```

**9. Added: Update** (resolved) · 2021-07-20 08:50 UTC

```diff
+ This incident has been resolved on AWS side. Engine start/stop is now functional.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2021-07-20 04:30 UTC | Major incident: Engines may fail to start and stop (this change) | outage |

All Firebolt changes: [timeline](https://rewindex.com/company/firebolt/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._


---
Canonical: https://rewindex.com/change/i87ca5dde3b1e6c · Markdown: https://rewindex.com/change/i87ca5dde3b1e6c.md · JSON: https://rewindex.com/api/v1/changes/i87ca5dde3b1e6c · Generated 2026-10-18T02:55:24.902Z