The remote server returned an error: (401) Unauthorized.

When your CSOM scripts in SharePoint 2013 fails with the error message "The remote server returned an error: (401) Unauthorized."
 
The resolution is to add new settings in web.config of your web application.
 
<appSettings>
        <add key="aspnet:AllowAnonymousImpersonation" value="false" />
    </appSettings>
 
Happy SharePointing :-)
 
 
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