DefaultAppPool set to ApplicationPoolIdentity won't work

Question

I built a WCF Data Service hosted in an ASP NET App that runs with IIS 7.

I'm able to access this service from other computers across the network just fine.

The thing is that I have DefaultAppPool set to NetwrokService, if I set it to ApplicationPoolIdentity, then the connection between Wpf Applications and the Data Service breaks.

Why?, In SQL Server Express 2012 I'm using "NT AUTHORITY\Servicio de red" ("Servicio de red" is "Network Service" in spanish) mapped to my database.

I understand that NetworkService is present in IIS7 for compatibility with previous versions, and IIS7 introduced ApplicationPoolIdentity to increase security since many applications use NetworkService.

That´s why I´d like to be able to use this ApplicationPoolIdentity but I don't know what setting is necessary for it to work.

My authentication setting is:

Rafael

Answer 1

Did you add IIS APPPOOL\DefaultAppPool to the users in SQL Server? (I assume your SQL Server is on the same machine as the IIS server? If not, then you have to add your computer name from the domain)