Snowflake incident
Azure - Switzerland North (Zürich): INC0143996
Snowflake experienced a critical incident on September 27, 2025 affecting Databases, Tables, and Views and Virtual Warehouses and 1 more component, lasting 4h 2m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Sep 27, 2025, 12:45 AM UTC
Current status: We've confirmed that this issue impacts service, and we're continuing to investigate to determine the source of the issue. We'll provide another update within 60 minutes. Customer experience: Customers hosted in the specified regions may be unable to access or use multiple core Snowflake services and features. Affected users may be unable to sign in, execute queries, or manage data. Incident start time: 00:03 UTC September 27, 2025
- identified Sep 27, 2025, 01:08 AM UTC
Current status: We've identified an issue with a third-party cloud platform, and we're coordinating with the provider to develop and implement a fix to restore service. We'll provide another update within 60 minutes. Customer experience: Customers hosted in the specified regions may be unable to access or use multiple core Snowflake services and features. Affected users may be unable to sign in, execute queries, or manage data. 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. Incident start time: 00:03 UTC September 27, 2025
- identified Sep 27, 2025, 02:14 AM UTC
Current status: We're continuing to coordinate with our third-party cloud platform to develop and implement a fix to restore service. We'll provide another update within 60 minutes. Customer experience: Customers hosted in the specified regions may be unable to access or use multiple core Snowflake services and features. Affected users may be unable to sign in, execute queries, or manage data. ETA: An ETA is not yet available. We'll provide one as soon as possible. Snowflake is working in close partnership with Microsoft Azure to address the incident, and can confirm that mitigation efforts are underway with the highest priority. In the meantime, we recommend that affected customers using replication initiate their failover procedures. Incident start time: 00:03 UTC September 27, 2025
- identified Sep 27, 2025, 03:13 AM UTC
Current status: We're continuing to coordinate with our third-party cloud platform to develop and implement a fix to restore service. Azure is actively investigating a recent networking change and is preparing a hotfix to address the issue. We'll provide another update within 60 minutes. Customer experience: Customers hosted in the specified regions may be unable to access or use multiple core Snowflake services and features. Affected users may be unable to sign in, execute queries, or manage data. ETA: An ETA is not yet available. We'll provide one as soon as possible. We are actively collaborating with Microsoft Azure to address the incident with the highest urgency. In the meantime, we recommend that affected customers using replication initiate their failover procedures. Incident start time: 00:03 UTC September 27, 2025
- monitoring Sep 27, 2025, 04:04 AM UTC
Current status: We've coordinated with our third-party cloud platform to implement 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 be unable to access or use multiple core Snowflake services and features. Affected users may be unable to sign in, execute queries, or manage data. Incident start time: 00:03 UTC September 27, 2025 Incident end time: 03:33 UTC September 27, 2025 Preliminary root cause: A network event at our third-party cloud provider has caused a disruption to Snowflake services.
- resolved Sep 27, 2025, 04:47 AM UTC
Current status: We've coordinated with our third-party cloud platform to implement the fix for this issue, and we've 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. Customer experience: Customers hosted in the specified regions may be unable to access or use multiple core Snowflake services and features. Affected users may be unable to sign in, execute queries, or manage data. Incident start time: 00:03 UTC September 27, 2025 Incident end time: 03:33 UTC September 27, 2025 Preliminary root cause: A network event at our third-party cloud provider has caused a disruption to Snowflake services. A root cause analysis (RCA) document will be published within ten business days.
- postmortem Oct 10, 2025, 03:41 AM UTC
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/INC0143996](https://community.snowflake.com/s/article/INC0143996)