Configuring the user-specific endpoints file
The best way to configure a server endpoint that locates your own Esri server is through the Analyst's Notebook user interface. However, the information is added to the user-specific ServerEndpoints.config file, which you can edit by hand.
About this task
The user-specific file is in XML format. You can use a simple text editor such as Notepad, but a dedicated XML editor is better. Badly formed XML stops the product from working.
Note: If you want to change the default tokenLifespan attribute value
        of an endpoint configured through the user interface, you can do this only by editing the
          ServerEndpoints.config file manually.
    Procedure
To add details of your own server endpoints to the user-specific
          ServerEndpoints.config file:
What to do next
You can add as many server endpoints as you need.
Tip: To remove unnecessary servers from the user interface list, you can remove
        the Esri demonstration server endpoints from the
        preinstalled server endpoints file. This is the portion of the file that you remove:
        
<endpoint name="EsriDemoBaseMapProvider"
          binding="basicHttpBinding"
          bindingConfiguration="arcGisHttpBinding"
          address="http://services.arcgisonline.com/ArcGIS/services/"
          contract="i2.Mapping.Esri.ArcGISModule.Proxy.ServiceCatalogPort"/>
<endpoint name="EsriDynamicMaps"
          binding="basicHttpBinding"
          bindingConfiguration="arcGisHttpBinding"
          address="http://serverapps.esri.com/ArcGIS/services"
          contract="i2.Mapping.Esri.ArcGISModule.Proxy.ServiceCatalogPort"/>
<endpoint name="EsriDemoRouting"
          binding="basicHttpBinding"
          bindingConfiguration="arcGisHttpBinding"
          address="http://tasks.arcgisonline.com/ArcGIS/services/"
          contract="i2.Mapping.Esri.ArcGISModule.Proxy.ServiceCatalogPort"/>
<endpoint name="DriveTimes"
          binding="basicHttpBinding"
          bindingConfiguration="arcGisHttpBinding"
          address="http://sampleserver3.arcgisonline.com/ArcGIS/services"
          contract="i2.Mapping.Esri.ArcGISModule.Proxy.ServiceCatalogPort"/>