I will be using a domain windows account(maintained in Active Directory) as Application pool identity in my web server. So i want the account to be a member of IIS_W
In the identity tag and use your windows domain and windows user name in the web.config file
In the IIS Server set the pool identity as ApplicationPool.
Disable anonymous authentication for the web application. Enable Impersonation and Windows Authenticaton. for the web Application in the IIS Box