How to Fix 'Login failed for user 'IIS APPPOOL\ASP.NET v4.0'' in SQL Server?

Troubleshooting "Login failed for user 'IIS APPPOOLASP.NET v4.0'" in IIS 7

Migrating web projects to IIS 7 can sometimes lead to the error "Login failed for user 'IIS APPPOOLASP.NET v4.0'". This usually indicates insufficient database access rights for the specified application pool identity. Here's how to resolve this authentication problem:

Solution:

1. Create a SQL Server Login for the App Pool:

   • Open SQL Server Management Studio. In the Security section, right-click on "Logins" and choose "New Login...".
   • Use IIS APPPOOL\ASP.NET v4.0 as the login name. Click "OK".

2. Assign Database Permissions:

   • Right-click the newly created login (IIS APPPOOL\ASP.NET v4.0). Select "Properties", then navigate to "User Mapping".
   • Select the target database. Grant the appropriate roles and permissions. For most applications, db_datareader and db_datawriter are sufficient. If your application uses stored procedures, ensure execute permissions are also granted.

By following these steps, you should grant the necessary access to your SQL Server database, resolving the login failure and allowing your web application to function correctly within IIS 7.

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