Updated: September 12, 2016
Applies To: SQL Server 2016
This topic describes breaking changes in Reporting Services. These changes might break applications, scripts, or functionalities that are based on earlier versions of SQL Server. You might encounter these issues when you upgrade, or in custom scripts or reports.
Custom security extensions need some modification to work with the new web portal. Security extensions need to use the IAuthenticationExtension2 interface.
The web portal application name changes from "ReportManager" to "ReportServerWebApp".
Behavior changes to SQL Server Reporting Services in SQL Server 2016
What's New in Reporting Services (SSRS)
Deprecated features in SQL Server Reporting Services in SQL Server 2016
Discontinued functionality to SQL Server Reporting Services in SQL Server 2016