Both the Web Server and Application Server installers provide the option to enable identity impersonation for both the Web and Application Server.
By default, the impersonation setting is set to false. The exception to this is if a previous Application Server install was done on your machine, the Impersonation option defaults to the last known setting.
If you enable impersonation for an application, the installer inserts a new identity element into that application's Web.config file and creates the encrypted credential values in the registry. If you did not select the impersonation option, you can configure impersonation manually.
Full details on creating encrypted account registry keys are available in the Microsoft article: “How to use the ASP.NET utility to encrypt credentials and session state connection strings” available at: http://support.microsoft.com/kb/329290/
Impersonation can be configured using the Web Application Management Console. See the Web Application Management Console module reference guide for more information.
For best practices on using impersonation, see the section on IIS and ASP.NET configuration for Web Server autologin in the Web Server module reference guide.
To manually configure impersonation, complete the following steps: