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Register todayBreaking changes in SQL Server Reporting Services in SQL Server 2016
Applies to: 
SQL Server Reporting Services (2016) ❌ SQL Server Reporting Services (2017) ❌ Power BI Report Server
For content related to previous versions of SQL Server Reporting Services (SSRS), see What is SQL Server Reporting Services?
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".
Additional resources
Training
Module
Build reports for finance and operations apps - Training
Organizations have a lot of data. When an organization grows, its ability to provide context for all that data becomes increasingly crucial. Reports can organize data in a meaningful way. Finance and operations apps include reporting tools to help you create reports for your organizations, SQL Server Reporting Services (SSRS), Microsoft Power BI, and Microsoft Excel reports. You can use these reporting tools to visualize a data set in many ways, including as a tabular layout with collapsible tables and by u
Documentation
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Reporting Services backward compatibility - SQL Server Reporting Services (SSRS)
Learn about changes in behavior of SQL Server Reporting Services, including features that are no longer available or scheduled to be removed in a future release.
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Learn about behavior changes in Reporting Services and how the features work or interact in SQL Server 2016 as compared to previous versions of SQL Server.
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Learn details about SQL Server Reporting Services features that are no longer available in different versions of Reporting Services.