Changes / Snowflake / Azure - UK South (London): INC0156355
Snowflake: Critical incident: Azure - UK South (London): INC0156355
Summary
Snowflake reported a critical outage in Azure - UK South (London) from 2026-04-29 03:23 UTC to 2026-04-29 04:44 UTC (1 h 21 min), affecting Snowpark Container Services connectivity, Openflow runtime access and connector data transfers. Restarting unhealthy infrastructure restored service; a postmortem RCA is available on Snowflake Community.
Machine-written from the diff below (Sol; type: incident outage). Check the diff before relying on it.
What changed
Before: not present
After: Azure - UK South (London): INC0156355
Before: not present
After: critical
Before: not present
After: postmortem
Before: not present
After: 2026-04-29 03:23 UTC
Before: not present
After: 2026-04-29 04:44 UTC
Before: not present
After: Azure - UK South (London) - Snowpark Container Services, Snowpark Container Services
Before: not present
After: <b>Current status:</b> We're investigating an issue with Snowflake Data Cloud. We'll provide an update within 30 minutes.
<b>Customer experience:</b> Customers hosted in the specified regions may experience errors or connectivity issues when using Snowpark Container Services. Openflow users may be unable to access their runtimes, and Openflow Connectors may fail to pull data from sources or push data to Snowflake.
<b>Incident start time:</b> 02:05 UTC April 29, 2026
Before: not present
After: <b>Current status:</b> We're continuing to investigate the issue with Snowflake Data Cloud. We'll provide another update within 30 minutes.
<b>Customer experience:</b> Customers hosted in the specified regions may experience errors or connectivity issues when using Snowpark Container Services. Openflow users may be unable to access their runtimes, and Openflow Connectors may fail to pull data from sources or push data to Snowflake.
<b>Incident start time:</b> 02:05 UTC April 29, 2026
Before: not present
After: <b>Current status:</b> 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.
<b>Customer experience:</b> Customers hosted in the specified regions may experience errors or connectivity issues when using Snowpark Container Services. Openflow users may be unable to access their runtimes, and Openflow Connectors may fail to pull data from sources or push data to Snowflake.
<b>Incident start time:</b> 02:05 UTC April 29, 2026
<b>Incident end time:</b> 04:11 UTC April 29, 2026
<b>Preliminary root cause:</b> A subset of infrastructure that processes DNS requests in the affected region became unhealthy, which caused service connectivity failures for Snowpark Container Services and Openflow.
Before: not present
After: <b>Current status:</b> We identified a subset of infrastructure that was unhealthy. We restarted that infrastructure and monitored the environment to confirm that the service has been restored. If you experience additional issues or have questions, please open a support case via Snowflake Community or the Support page in Snowsight.
<b>Customer experience:</b> Customers hosted in the specified regions may experience errors or connectivity issues when using Snowpark Container Services. Openflow users may be unable to access their runtimes, and Openflow Connectors may fail to pull data from sources or push data to Snowflake.
<b>Incident start time:</b> 02:05 UTC April 29, 2026
<b>Incident end time:</b> 04:11 UTC April 29, 2026
<b>Preliminary root cause:</b> A subset of infrastructure that processes DNS requests in the affected region became unhealthy, which caused service connectivity failures for Snowpark Container Services and Openflow.
A root cause analysis (RCA) document will be published within five business days.
Before: not present
After: 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/INC0156355](https://community.snowflake.com/s/article/INC0156355)
First version of this incident archived by Rewindex. View the live incident (opens in new tab).
History of this incident
| When (UTC) | Change | Kind |
|---|---|---|
| Critical incident: Azure - UK South (London): INC0156355 (this change) Snowflake reported a critical outage in Azure - UK South (London) from 2026-04-29 03:23 UTC to 2026-04-29 04:44 UTC (1 h 21 min), affecting Snowpark Container Services connectivity, Openflow runtime access and connector data transfers. Restarting unhealthy infrastructure restored service; a postmortem RCA is available on Snowflake Community. | Major incident |
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