Why Does 'Login failed for user 'IIS APPPOOL\ASP.NET v4.0'' Occur When Migrating to IIS 7?

IIS 7 login error: "IIS APPPOOLASP.NET v4.0" login failed

When migrating a web application from CASSINI to IIS 7, users may encounter the error "Login failed for user 'IIS APPPOOLASP.NET v4.0'" when accessing the site.

Error reason

This error usually occurs when the IIS APPPOOLASP.NET v4.0 user does not have login permissions for the database used by the application.

Solution

To resolve this issue, please follow these steps:

1. Create login in MS SQL Server:

   • Open SQL Server Management Studio (SSMS) and connect to the instance hosting the database.
   • Expand the Security node in Server Object Explorer.
   • Right-click on "Logins" and select "New Login..."
   • Enter 'IIS APPPOOLASP.NET v4.0' as the login name and click OK.

2. Grant database permissions:

   • Right-click on the login created in step 1 and select Properties.
   • Go to the User Mapping tab.
   • Check the appropriate checkboxes to grant permissions to the database and necessary roles. For example, db_datareader and db_datawriter.

3. Refresh IIS configuration:

   • In Internet Information Services (IIS) Manager, navigate to the application's site and pool.
   • Recycle the application pool to refresh the configuration.

Other notes:

• If the application uses stored procedures, make sure the 'db_execute' permission is granted to the application pool login.
• If the error persists after performing these steps, check that the appropriate firewall rules have been set up to allow connections from the web server to the database.

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