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You want to stop and restart IIS as a whole, individual IIS services, or individual sites.
To restart all IIS services on the server:
In the left pane, right-click on the server node and select All Tasks → Restart IIS.
Choose whether to restart IIS, stop IIS, start IIS, or reboot the server and click OK.
To restart an individual web or FTP site, right-click on the node for the site and select Stop, then repeat and select Start.