WSUS Client Diagnostic Tool
But are updates actually failing? You must either provide an installation source at the time you try to install such server roles, or configure a source for Features on Demand in Group Policy.
You have to specify the name of the Update server so that client can communicate and get update from the local update server. As a best practice, create at least one computer group to test updates before you deploy them to other computers in your organization. Although there is no theoretical limit to a hierarchy, only deployments with a hierarchy of five levels deep have been tested by Microsoft Corporation.
WSUS Client Diagnostic Tool - Windows then downloads the selected updates in the background.