IIS permissions for data base access

When I try to access my SQLExpress database using a .NET web page I get the following error:

Cannot open database <dbname> requested by the login. The login failed.
Login failed for user 'IIS APPPOOL\.NET v4.5'

This started happening after I updated the database. Before the update everything connected without issue.

.NET v4.5 has cull control of the folder containing the database, the mdf file, and the log file.

Any suggestions what I have wrong?

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Granting web application access to database files is dangerous, insecure, and unnecessary.
Database can be accessed using MSSQL interface, and the user should be allowed to select from tables on MSSQL, and all mdb files should be owned by MSSQL server user.
Dan McFaddenSystems EngineerCommented:
What's happening is that the application is using the AppPool's identity to try to access your database instance.  You should be using either a domain account or SQL account which has been granted permissions to connect to and use the database.

Usually this is accomplished 1 of 2 ways:

1. you create a service account for the AppPool and grant that service account database access
2. you config the database connection string in the web.config to use a specific user account when your app tries to make a connection to the db.


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Vitor MontalvãoMSSQL Senior EngineerCommented:
This started happening after I updated the database.
Which update did you perform?
OhioWoodWrightAuthor Commented:
I also needed to Configure sql server to accept both Windows and sql logins
One should be sufficient.
You probably use 2 SQL pools unintentionally.
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Microsoft IIS Web Server

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