INC0149526

Final update

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/INC0149526](https://community.snowflake.com/s/article/INC0149526)

1. Postmortem · Jan 15, 20:56 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/INC0149526](https://community.snowflake.com/s/article/INC0149526)
2. Resolved · Jan 8, 20:22 UTC
   Current status: We've confirmed after a period of monitoring that our reversal of the offending change has remediated the issue, and our service is healthy. Users with existing sessions that are still impacted should refresh their sessions to experience relief. 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 have been unable to access or use Snowflake services and features using Snowsight. This specifically impacted users with existing sessions in Snowsight and not new sessions. Incident start time: 18:02 UTC January 08, 2026 Incident end time: 19:00 UTC January 08, 2026 Preliminary root cause: A change contained within the recent Snowsight release related to a network policy check caused issues with session deserialization, which resulted in errors for users with active sessions. A root cause analysis (RCA) document will be published within five business days.
3. Monitoring · Jan 8, 19:22 UTC
   Current status: Our investigation has identified that a change within the recent Snowsight release caused this issue and resulted in errors for users with existing sessions. We've reverted the offending change and we're continuing to monitor to ensure our service remains healthy. Users with existing sessions that are still impacted should refresh their sessions to experience relief. Customer experience: Customers hosted in the specified regions may be unable to access or use Snowflake services and features using Snowsight. This is specifically impacting users with existing sessions in Snowsight and not new sessions. Incident start time: 18:02 UTC January 08, 2026 Incident end time: 19:00 UTC January 08, 2026 Preliminary root cause: A change contained within the recent Snowsight release related to a network policy check caused issues with session deserialization, which resulted in errors for users with active sessions.
4. Investigating · Jan 8, 18:49 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 be unable to access or use Snowflake services and features using Snowsight. This is specifically impacting users with existing sessions in Snowsight and not new sessions.