In Tableau Server, only an inactivity timer was used to check the lifetime of a user session, and the session's lifetime could be extended indefinitely. The session now expires based on an absolute timeout.
In Tableau Server, permissions for configuration files allowed unauthorized users access.
Publishing a workbook with a Web Data Connector data source name longer than 255 characters resulted in an error.
In Tableau Server, when using a published Other Databases (ODBC) data source, you couldn't add an aggregated measure to a view.