Why Does My ASP.NET App Fail to Connect to the Database with 'Login Failed for user 'xyz\ASPNET''?

Resolving ASP.NET Database Connection Failures: "Cannot open database" Login Error

Database connectivity problems are common in web services. A frequent error is:

"Cannot open database "test" requested by the login. The login failed. Login failed for user 'xyzASPNET'."

This error means your ASP.NET application, using the 'xyzASPNET' account, can't access the 'test' database. The problem lies in your SQL Server configuration or connection string.

The error indicates insufficient permissions for 'xyzASPNET' to access the 'test' database. Here are two solutions:

1. Create a SQL Server Login: Add a new SQL Server user account specifically for 'xyzASPNET'. Grant this account the necessary database access permissions. This allows your web service to connect correctly.

2. Modify the Connection String: Use a different SQL Server account with appropriate access to the 'test' database. Update your connection string with the credentials of this account. For example:

<code>connectionString="Server=.\SQLExpress;Database=IFItest;User ID=xyz;pwd=top$secret"</code>

Remember to replace placeholders like xyz and top$secret with your actual credentials.

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