Azure - UK South (London): INC0156355

Update timeline

1. investigating Apr 29, 2026, 03:23 AM UTC

   Current status: We're investigating an issue with Snowflake Data Cloud. We'll provide an update within 30 minutes. Customer experience: Customers hosted in the specified regions may experience errors or connectivity issues when using Snowflake Openflow. Incident start time: 02:05 UTC April 29, 2026

2. investigating Apr 29, 2026, 03:53 AM UTC

   Current status: We're continuing to investigate the issue with Snowflake Data Cloud. We'll provide another update within 30 minutes. Customer experience: Customers hosted in the specified regions may experience errors or connectivity issues when using Snowflake Openflow. Incident start time: 02:05 UTC April 29, 2026

3. monitoring Apr 29, 2026, 04:27 AM UTC

   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 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. Incident start time: 02:05 UTC April 29, 2026 Incident end time: 04:11 UTC April 29, 2026 Preliminary root cause: An internal component responsible for processing DNS requests in the affected region became unhealthy, which caused service connectivity failures for Snowpark Container Services and Openflow.

4. resolved Apr 29, 2026, 04:44 AM UTC

   Current status: 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. Customer experience: 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. Incident start time: 02:05 UTC April 29, 2026 Incident end time: 04:11 UTC April 29, 2026 Preliminary root cause: 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.

5. postmortem May 07, 2026, 02:26 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/INC0156355](https://community.snowflake.com/s/article/INC0156355)