Error HRESULT E_FAIL has been returned from a call to a COM component

This works perfectly fine

What is "this"? It could certainly help if you show what code you are using.

The error "HRESULT E_FAIL has been returned from a call to a COM component" typically indicates a failure in a COM component, which could be caused by various factors. When running your application on Azure App Service, there are a few possible reasons for this error:

Missing or Incorrect Connection String: Double-check your database connection string in the Azure App Service configuration. Make sure it is correctly configured to connect to your Azure database instance. Ensure that all the required connection details, such as server name, username, password, and database name, are provided accurately.

Firewall or Network Configuration: Azure databases often have firewall rules that restrict access from specific IP addresses or Azure services. Ensure that your App Service's outbound IP address or the App Service itself is added to the database server's firewall rules. Check if the database server allows incoming connections from the App Service.

Access Permissions: Verify that the database user account specified in the connection string has appropriate permissions to access the database. Ensure that the user has the necessary read, write, and execute permissions for the required database objects.

Database Provider Compatibility: Check the compatibility between the database provider/library used in your application and the version of the Azure database you are connecting to. Ensure that you are using a database provider/library that supports connecting to Azure databases. If necessary, update the database provider or library to a compatible version.

Environmental Differences: Compare the runtime environment on your local machine and the Azure App Service environment. Check if there are any differences in installed software, frameworks, or configuration that might cause compatibility issues. Ensure that your application and its dependencies are properly installed and configured in the App Service environment.

Additional Logging and Debugging: Enable detailed logging and diagnostics in your application to gather more information about the error. Capture any additional exception details, error messages, or stack traces that can provide further insights into the root cause of the issue. Azure App Service provides options for viewing application logs and enabling remote debugging, which can help in troubleshooting.

If the issue persists after checking these factors, it may be helpful to provide more specific details about your application, such as the programming language, database provider, and any relevant code snippets, to assist in further troubleshooting.

Hello @Aashishkebab ,

Following up to see if you have a chance to check my previous response and helped. Do let us know if you have any further questions on this.