The error message you are encountering, [Databricks][DatabricksJDBCDriver][500593] Communication link failure. Failed to connect to server. Reason: HTTP Response code: 403, Error message: Unknown, typically indicates an issue with authentication or network access.

Refer https://community.databricks.com/t5/machine-learning/databricks-databricksjdbcdriver-500593-communic... on previously faced issue (With resolution)