Authentication is the mechanism by which SSRS will establish the identity of a user. It doesn't identify the user, but rather establishes the method by which a user will identify themselves to the Reporting Services server.
This recipe is more focused on determining what the authentication type is set to and how to understand what your choices are. You will need to have access to the server on which SSRS is running, with administrative rights.
Open File Explorer in Windows.
Navigate to the folder where your instance of Reporting Services is installed. This will typically be in the format of
Program Files\Microsoft SQL Server\instance name\Reporting Services\ReportServer
. (Note there is a space between Reporting Services, but no space with ReportServer.)In a default installation of SQL Server 2016, this would be
C:\Program Files\Microsoft SQL Server\MSRS13.MSSQLSERVER\Reporting Services\ReportServer
.Open the
rsreportserver...