How to enable Anonymous access to Report Server? Any Security considerations?

Please note that when using anonymous access, every person accesses the reports under the anonymous user context, and no one will have rights to administer Reporting Services through Report Manager. This is the reason why it is not recommended to use anonymous access in Reporting Services.

In order to differentiate between users, we need to either disable anonymous access or use a custom security extension. 

In some special situations, it may be necessary to use anonymous access. For security considerations, we can use the steps as below:

1. Add the anonymous user to the System User role

2. Create an Item-level role with all of the tasks you want this user to be able to use, and then assign the anonymous user to that role at the root level.

3. Check permissions for the anonymous user on folders that SRS uses:

For example:
C:\Program Files\Microsoft SQL Server\MSSQL\Reporting Services (and subfolders)

C:\<windows>\Microsoft.NET\Framework\v1.1.4322\Temporary ASP.NET Files

The temp folder for the anonymous user

Note: Step1 & Step2 can be achieved through Report Manager only if anonymous access is disabled and the logged-on user is a member of the System Administrator role.