Hello @sensanjoy ,

Based on this stacktrace, the cluster used in this case looks as shared access mode with Unity Catalog enabled cluster to me.

Shared access mode clusters do not allow such connections.

This use case can be addressed by:

• Using a single user cluster Or
• Considering the usage of Lakehouse Query Federation (https://learn.microsoft.com/en-us/azure/databricks/query-federation/)

Regards