Why is my ASP.NET Web Service Failing to Access the Database with the Error 'Login failed for user 'xyz\ASPNET''?

Troubleshooting ASP.NET Web Service Database Connection Failures

Your ASP.NET web service might fail to connect to the database, displaying the error: "Cannot open database "test" requested by the login. The login failed. Login failed for user 'xyzASPNET'". This means the application's user account ('xyzASPNET') lacks the necessary database access permissions.

Problem:

The 'xyzASPNET' account, used by the ASP.NET application, doesn't have authorization to access the specified database.

Resolution:

Two approaches can fix this:

1. Grant Database Access to 'xyzASPNET': In SQL Server Management Studio, create a new SQL Server login for the 'xyzASPNET' account and assign appropriate database permissions (e.g., db_datareader, db_datawriter).

2. Use Explicit Credentials in Connection String: Modify your web service's connection string to use a different user account with proven database access. For example:

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

Replace 'xyz' with a valid username and 'top$secret' with the corresponding password.

Important Notes:

• Windows Authentication: If using Windows Authentication (Integrated Security=True), verify that the 'xyzASPNET' account has the required database permissions within the SQL Server's security settings.

• SQL Server Authentication: When using SQL Server Authentication (providing explicit User ID and Password), double-check the username, password accuracy, and ensure the user possesses the necessary database privileges.

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