When administering Portal for ArcGIS, occasionally you'll need to start and stop your portal to perform maintenance or configure advanced settings.
Your portal is powered by one Windows service, the Portal for ArcGIS service. You can view, stop, or start this service under Control Panel > Administrative Tools > Services.
To stop the Portal for ArcGIS service, select it in the Services panel and click Stop the service. To start it, select Start the service.