KB-8042: What changes are made when deploying Report Services on an existing SQL instance
Applies to: Direct Control version 5.3.1 and greater on all supported platforms.
Question: Does the report services tool alter any SQL configuration?
Answer: When choosing to deploy the Report Services on an existing SQL instance, the only modification to that SQL instance is to add 2 Windows integrated logins:
Login
Granted DB role (Role in Report Service DB)
<The specified service account>
SnapshotService
[NT Authority\Authenticated Users]
SnapshotViewer
Note: We will not re-create these logins if they already exist.