ArcGIS Server initial configuration

Once ArcGIS Server is installed and authorized, you need to either create a new ArcGIS Server site or join an existing ArcGIS Server site. When you open ArcGIS Server Manager, the web-based ArcGIS Server administration panel, for the first time, you will be prompted to create a new site or join an existing site. An ArcGIS Server site is a deployment of ArcGIS Server.