>What version of IIS ?

8.5

>Are you sure that the new site is pointed to the correct application pool. The default behaviour in IIS7 when creating a new site is to create an additional app pool of the same name using the ApplicationPoolIdentity identity. You may need to change the Application Pool in the site advanced settings.

The new site is pointing to the same application pool. The only way I can make this work is to go custom. If I bind it to the application pool, it cannot work. I thought I had to change something in SQL Server. I never had to do that before. I usually only bind the application pool of the new Web site to an existing one and adjust the connection string. But, this time, there is something else that is needed to be done and I just can't figure out what it is.