Why Does 'Login Failed for User 'IIS APPPOOL\ASP.NET v4.0'' Occur in IIS 7 and How Can I Fix It?

Troubleshooting "Login Failed for User 'IIS APPPOOLASP.NET v4.0'" in IIS 7

When migrating a web application to IIS 7 locally, you might encounter a situation where the browser tries to download the webpage instead of displaying it. Checking the Event Viewer often reveals SQL Server connection errors, specifically the message: "Login failed for user 'IIS APPPOOLASP.NET v4.0'". This indicates a lack of necessary SQL Server permissions for the application pool identity.

The solution involves explicitly granting SQL Server access rights to the IIS APPPOOL\ASP.NET v4.0 user.

Permission Configuration Steps:

1. Launch SQL Server Management Studio (SSMS).
2. Navigate to the server's "Security" folder.
3. Right-click on "Logins" and choose "New Login...".
4. In the new login dialog, specify IIS APPPOOL\ASP.NET v4.0 as the login name.
5. Configure user roles: Right-click the newly created login, select "Properties", then "User Mapping".
6. Select the relevant database(s) and assign the appropriate roles. If your project uses Entity Framework (EF), ensure the user has execute permissions for stored procedures. Further details on role assignments are available via [link to further information - replace bracketed information with actual link if available].

This process ensures the application pool has the correct access to your SQL Server databases, resolving the login failure and allowing your web application to function correctly.

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