How to: Stop an Instance of Notification Services (SQL Server Management Studio)
Each instance of Notification Services has an engine on each server that runs a hosted event provider, generator, or distributor. Typically, the NS$instanceName Microsoft Windows service runs the Notification Services engine. You can stop all Windows services associated with an instance of Notification Services by using Microsoft SQL Server Management Studio.
|This procedure does not apply to clusters. On a cluster, you must use Cluster Administrator to stop the Generic Service that is configured to run the instance's Windows service.|
In Object Explorer, expand the Notification Services node.
Right-click the instance of Notification Services that you want to stop and then select Stop.
Notification Services attempts to connect to each server that runs the NS$instanceName Windows service and then stop the service. A dialog box displays the status for each service.