Why Does 'IIS APPPOOL\ASP.NET v4.0' Fail to Connect to SQL Server After Migrating to IIS 7?

Troubleshooting Database Connection Issues: 'IIS APPPOOLASP.NET v4.0' Login Failure in IIS 7

Migrating a web application from Cassini to IIS 7 can sometimes lead to database connection problems, specifically a login failure for the 'IIS APPPOOLASP.NET v4.0' user. This guide outlines the solution.

The core issue is the lack of a corresponding SQL Server login for this application pool identity. To fix this, you need to create a SQL Server login and grant it the necessary database permissions.

Creating the SQL Server Login

1. Launch SQL Server Management Studio (SSMS) and connect to your SQL Server instance.
2. Expand the "Security" node, right-click "Logins," and select "New Login...".
3. Enter 'IIS APPPOOLASP.NET v4.0' as the login name.

Assigning Database Permissions

1. Right-click the newly created login and choose "Properties."
2. Navigate to the "User Mappings" tab.
3. Select the database your application uses.
4. Assign appropriate roles, such as 'db_datareader' and 'db_datawriter', granting read and write access to the database.

Important Notes:

• Stored Procedures: If your application uses Entity Framework or directly calls stored procedures, ensure the 'IIS APPPOOLASP.NET v4.0' login has execute permissions on those procedures.
• Antivirus Interference: Sometimes, antivirus software can block SQL Server connections. Temporarily disabling your antivirus might help diagnose if this is the cause.

By following these steps, you should successfully resolve the 'IIS APPPOOLASP.NET v4.0' login failure and restore your database connection.

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