A few people have asked me where they can find the WSUS service in the Windows Server Services list in order to restart it.
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The simple and best way to restart the WSUS service on a Windows server 2003, 2008, 2012 and 2016 is to open the cmd command line and type the command below to stop the service:
net stop WSUSService
and and below command to start the service:
net start WSUSService