# Squarespace: Critical incident: Acuity Scheduling / 500 error

**Summary:** Acuity Scheduling experienced a critical service disruption involving 500 errors, starting at 2025-09-23 14:55 UTC and resolved at 2025-09-23 15:24 UTC; the reported duration was 28 min. A fix was implemented at 2025-09-23 15:02 UTC, but no root cause was stated. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2025-09-23 14:55 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/k1dly2qcvs8y](https://stspg.io/k1dly2qcvs8y)
- [Company: Squarespace](https://rewindex.com/company/squarespace.md)
- Versions: before (none: first archived) → after incident\_version:260/bf01k990bll7@9d70a8bc2ca0
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Acuity Scheduling / 500 error
```

**2. Added: Impact**

```diff
+ critical
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2025-09-23 14:55 UTC
```

**5. Added: Resolved time**

```diff
+ 2025-09-23 15:24 UTC
```

**6. Added: Update** (investigating) · 2025-09-23 14:55 UTC

```diff
+ We are currently experiencing a service disruption. Our Engineering team is working to identify the root cause and implement a solution. We will provide an update as soon as possible.
```

**7. Added: Update** (monitoring) · 2025-09-23 15:02 UTC

```diff
+ A fix has been implemented and we are monitoring the results.
```

**8. Added: Update** (resolved) · 2025-09-23 15:24 UTC

```diff
+ The incident has been resolved.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2025-09-23 14:55 UTC | Critical incident: Acuity Scheduling / 500 error (this change) | outage |

All Squarespace changes: [timeline](https://rewindex.com/company/squarespace/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/if15298134ee6cc · Markdown: https://rewindex.com/change/if15298134ee6cc.md · JSON: https://rewindex.com/api/v1/changes/if15298134ee6cc · Generated 2026-10-18T03:55:38.911Z