The Diagnostic Service Host (WdiServiceHost) service enables problem detection, troubleshooting, and resolution for Windows components. If this service is stopped, diagnostics cannot function. The Diagnostic Service Host service is part of the Network Diagnostic Framework that is used to troubleshoot network connectivity issues. When a user selects Diagnose and Repair from the Network and Sharing Center or the Network Connection context menu, the Diagnostic Policy Service starts the Diagnostic Service Host service. The service continues to run until the computer is restarted.
This service is installed by default and its startup type is Manual. When the Diagnostic Service Host service is started in its default configuration, it logs by on using the Local Service account.
This service is not dependent on any other system service, nor is any service dependent on it.