# Snowflake: Major incident: INC20000190

**Summary:** Snowflake reported a major incident in which customers in the listed AWS, Azure and GCP regions could be unable to sign in to Snowflake Cowork. It started at 2026-09-01 09:58 UTC and was resolved at 2026-09-01 13:50 UTC. All other Snowflake features were unaffected; Snowflake identified the source but did not specify the cause or fix. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-09-01 09:58 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/5css9pgmdpnq](https://stspg.io/5css9pgmdpnq)
- [Company: Snowflake](https://rewindex.com/company/snowflake.md)
- Versions: before (none: first archived) → after incident\_version:164/847dlygl25yb@b7707b9b02ce
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ INC20000190
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ postmortem
```

**4. Added: Start time**

```diff
+ 2026-09-01 09:58 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-09-01 13:50 UTC
```

**6. Added: Affected components**

```diff
+ AI and ML, AWS - Africa (Cape Town) - AI and ML, AWS - Asia Pacific (Jakarta) - AI and ML, AWS - Asia Pacific (Malaysia) - AI and ML, AWS - Asia Pacific (Mumbai) - AI and ML, AWS - Asia Pacific (New Zealand) - AI and ML, AWS - Asia Pacific (Osaka) - AI and ML, AWS - Asia Pacific (Seoul) - AI and ML, AWS - Asia Pacific (Singapore) - AI and ML, AWS - Asia Pacific (Sydney) - AI and ML, AWS - Asia Pacific (Thailand) - AI and ML, AWS - Asia Pacific (Tokyo) - AI and ML, AWS - Canada (Central) - AI and ML, AWS - Europe (Frankfurt) - AI and ML, AWS - Europe (Ireland) - AI and ML, AWS - Europe (London) - AI and ML, AWS - Europe (Paris) - AI and ML, AWS - Europe (Stockholm) - AI and ML, AWS - Europe (Zürich) - AI and ML, AWS GovCloud - DoD - AI and ML, AWS - GovCloud (US-East) - AI and ML, AWS - GovCloud (US-West) - AI and ML, AWS - South America (São Paulo) - AI and ML, AWS - US East (N. Virginia) - AI and ML, AWS - US East (Ohio) - AI and ML, AWS - US West (Commercial Gov - Oregon) - AI and ML, AWS - US West (Oregon) - AI and ML, Azure - Australia East (New South Wales) - AI and ML, Azure - Canada Central (Toronto) - AI and ML, Azure - Central India (Pune) - AI and ML, Azure - Central Korea (Seoul) - AI and ML, Azure - Central US (Iowa) - AI and ML, Azure - East US 2 (Virginia) - AI and ML, Azure - East US (Virginia) - AI and ML, Azure - Japan East (Tokyo, Saitama) - AI and ML, Azure - Mexico (Central) - AI and ML, Azure - North Europe (Ireland) - AI and ML, Azure - South Central US (Texas) - AI and ML, Azure - Southeast Asia (Singapore) - AI and ML, Azure - Sweden Central (Gävle) - AI and ML, Azure - Switzerland North (Zürich) - AI and ML, Azure - UAE North (Dubai) - AI and ML, Azure - UK South (London) - AI and ML, Azure - US Gov (Virginia) - AI and ML, Azure - West Europe (Netherlands) - AI and ML, Azure - West US 2 (Washington) - AI and ML, GCP - Australia Southeast 2 (Melbourne) - AI and ML, GCP - Europe West 2 (London) - AI and ML, GCP - Europe West 3 (Frankfurt) - AI and ML, GCP - Europe West 4 (Eemshaven) - AI and ML, GCP - Middle East (Dammam) - AI and ML, GCP - US Central 1 (Iowa) - AI and ML, GCP - US East 4 (N. Virginia) - AI and ML
```

**7. Added: Update** (investigating) · 2026-09-01 09:58 UTC

```diff
+ Current status: We're investigating an issue affecting sign-ins to Snowflake Cowork. We'll provide an update within 60 minutes. Customer experience: Customers hosted in the specified regions may be unable to sign in to Snowflake Cowork, and may see a message indicating that sign-in was unsuccessful. All other Snowflake features are not impacted. ETA: An ETA is not yet available. We'll provide one as soon as possible. In the meantime, we recommend that affected customers using replication initiate their failover procedures. Workaround: There are currently no available workarounds for this issue. Incident start time: 00:00 UTC September 01, 2026
```

**8. Added: Update** (identified) · 2026-09-01 10:32 UTC

```diff
+ Current status: We've identified the source of the issue, and we're developing and implementing a fix to restore service. We'll provide another update within 1 hour. Customer experience: Customers hosted in the specified regions may be unable to sign in to Snowflake Cowork, and may see a message indicating that sign-in was unsuccessful. All other Snowflake features are not impacted. ETA: An ETA is not yet available. We'll provide one as soon as possible. Workaround: There are currently no available workarounds for this issue. Incident start time: 00:00 UTC September 01, 2026
```

**9. Added: Update** (identified) · 2026-09-01 11:36 UTC

```diff
+ Current status: We've identified the source of the issue, and are continuing the deployment of the fix to restore service. The majority of our customers should now be able to sign back into Snowflake Cowork. We'll provide another update within 1 hour. Customer experience: Customers hosted in the specified regions may be unable to sign in to Snowflake Cowork, and may see a message indicating that sign-in was unsuccessful. All other Snowflake features are not impacted. ETA: An ETA is not yet available. We'll provide one as soon as possible. Workaround: There are currently no available workarounds for this issue. Incident start time: 00:00 UTC September 01, 2026
```

**10. Added: Update** (monitoring) · 2026-09-01 12:44 UTC

```diff
+ Current status: We've implemented the fix for this issue, and we'll continue to monitor the environment until we're confident all services are functioning properly. Customer experience: Customers hosted in the specified regions may have been unable to sign in to Snowflake Cowork, and may have seen a message indicating that sign-in was unsuccessful. All other Snowflake features were not impacted. Workaround: There were no available workarounds for this issue. Incident start time: 00:00 UTC September 01, 2026 Incident end time: 11:55 UTC September 01, 2026 Preliminary root cause: An update to the underlying database objects responsible for managing CoWork sign-on mechanisms experienced a configuration error which resulted in the symptoms observed.
```

**11. Added: Update** (resolved) · 2026-09-01 13:50 UTC

```diff
+ Current status: We've implemented the fix for this issue and monitored the environment to confirm that service was restored. If you experience additional issues or have questions, please open a support case via Snowflake Community or the Support page in Snowsight. Customer experience: Customers hosted in the specified regions may have been unable to sign in to Snowflake Cowork, and may have seen a message indicating that sign-in was unsuccessful. All other Snowflake features were not impacted. Workaround: There were no available workarounds for this issue. Incident start time: 00:00 UTC September 01, 2026 Incident end time: 11:55 UTC September 01, 2026 Preliminary root cause: An update to the underlying database objects responsible for managing CoWork sign-on mechanisms experienced a configuration error which resulted in the symptoms observed. A root cause analysis (RCA) will be conducted and a summary will be shared on the Snowflake status page within 5 business days.
```

**12. Added: Update** (postmortem) · 2026-09-09 11:25 UTC

```diff
+ Snowflake Engineering has completed the postmortem of this service incident. A detailed Root Cause Analysis \(RCA\) is available on the Snowflake Community site:  [https://community.snowflake.com/s/article/INC20000190](https://community.snowflake.com/s/article/INC20000190)
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-09-01 09:58 UTC | Major incident: INC20000190 (this change) | outage |

All Snowflake changes: [timeline](https://rewindex.com/company/snowflake/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/i5d3bb7bd6e7f81 · Markdown: https://rewindex.com/change/i5d3bb7bd6e7f81.md · JSON: https://rewindex.com/api/v1/changes/i5d3bb7bd6e7f81 · Generated 2026-10-18T01:53:58.730Z