Can't access a Database remotedly

Question

I have an ASP NET App that hosts a WCF Data Service which allows access to an Entity Data Model built from a database.

I already configured SQL Serer 2012 Express to accept remote connections, added a login NT AUTHORITY\Servicio de red (Network Service) with default schema as dbo, granted permission to this Servicio de red to select, insert, update, delete to the tables I'm trying to access from an application.

Configured the service to use verbose errors, and this is what I got when trying to run an aspplication that uses the Data Service:

Basically, it says that the login failed for IIS APPPOOL\DefaultAppPool.

What else do I have to do?

Answer 1

I solved it using NetworkService in IIS for DefaultAppPool