Sometime, you will need to change Application Pool’s identity to run under different credential.
One case example is to allow Application Pool to access database under credential that has special privilege.
Here’s how you do it: pull up your IIS 7.0 > select “Application Pools” menu on the left > select the name of the Application Pool you want to modify > click “Advanced Settings” on the right menu.
The default Identity is “ApplicationPoolIdentity”.
When you click on the ellipsis of the Identity parameter, here’s what you will see: