Open up Windows Home Server Console from a machine on your network and click on Settings. Then click the Shut Down button.
The Shut Down screen appears and the rest of the console fades in the background. Now you can shutdown or Restart the server.
A message pops up indicating your connection has been lost, and you’ll be able to reconnect after it starts back up.
Windows Home Server is designed so you can accomplish pretty much everything from the Home Server Console, including a Shutdown or Restart.