# MongoDB Atlas: Major incident: Cluster connectivity issues in Azure westus

**Summary:** MongoDB Atlas reported a major outage affecting some Azure westus clusters: intermittent connection failures, inter-node communication issues, nodes appearing down, and delayed cluster modifications. It started 2026-07-23 16:21 UTC and resolved 2026-07-23 20:28 UTC (4 h 6 min); Azure confirmed networking issues, and recovery completed after Azure rolled out mitigation. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-07-23 16:21 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/ycvlxh9rhwkw](https://stspg.io/ycvlxh9rhwkw)
- [Company: MongoDB Atlas](https://rewindex.com/company/mongodb-atlas.md)
- Versions: before (none: first archived) → after incident\_version:152/ktcy0km7x49f@4419f292c927
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Cluster connectivity issues in Azure westus
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-07-23 16:21 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-07-23 20:28 UTC
```

**6. Added: Affected components**

```diff
+ MongoDB Cloud
```

**7. Added: Update** (investigating) · 2026-07-23 16:21 UTC

```diff
+ We are currently investigating an issue with Azure clusters in westus region.  Please refer to the azure status post here for more information https://azure.status.microsoft/en-us/status.
```

**8. Added: Update** (identified) · 2026-07-23 16:38 UTC

```diff
+ Azure has confirmed that there are networking issues in the westus region.  Please follow the official azure status post for more detailed updates https://azure.status.microsoft/en-us/status
```

**9. Added: Update** (identified) · 2026-07-23 18:26 UTC

```diff
+ We are aware of an ongoing Azure networking incident affecting the West US region. Some Atlas clusters hosted in Azure West US may experience intermittent connectivity issues, including failures connecting to clusters, issues with communication between cluster nodes, nodes appearing down, and delays to cluster modifications. Azure is investigating the issue and evaluating mitigation options. We will provide additional updates as more information becomes available.
```

**10. Added: Update** (identified) · 2026-07-23 18:54 UTC

```diff
+ Azure is rolling out a mitigation for the ongoing networking incident affecting the West US region, and we are seeing signs of recovery. Some Atlas clusters hosted in Azure West US may continue to experience intermittent connectivity issues, including failures connecting to clusters, issues with communication between cluster nodes, nodes appearing down, and delays to cluster modifications. We are monitoring recovery closely and will provide additional updates as more information becomes available.
```

**11. Added: Update** (resolved) · 2026-07-23 20:28 UTC

```diff
+ Azure has rolled out mitigation for the networking incident affecting the West US region and recovery is complete.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-07-23 16:21 UTC | Major incident: Cluster connectivity issues in Azure westus (this change) | outage |

All MongoDB Atlas changes: [timeline](https://rewindex.com/company/mongodb-atlas/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/i621c0184f99f8a · Markdown: https://rewindex.com/change/i621c0184f99f8a.md · JSON: https://rewindex.com/api/v1/changes/i621c0184f99f8a · Generated 2026-10-18T00:38:38.595Z