I have a Sitefinity ASP.NET web site which has a database `Db1`. I have the database attached to SQL Server Management Studio.

When I run the ASP.NET application, it doesn't seem to have permission to access the database. Sitefinity fails to connect to the existing db, then tries to create a new db, which it throws this error:

> 
> CREATE DATABASE permission denied in database 'master'
> 
> 
> 

The connection string is:

```
<add connectionString="data source=localhost\sqlexpress;Integrated Security=SSPI;initial catalog=Db1" providerName="System.Data.SqlClient" dbType="MsSql" name="Sitefinity" />

```

In SQL Management Studio, I connect to the localhost\SQLEXPRESS instance using Windows Authentication.

I think the problem is, I need to give the ASP.NET process user, permission to access the database `Db1`. Where can I find this user and how can I give permission?

I'm also unsure if the app should be using a proper SQL Server user to connect instead of Windows Authentication.