403 Forbidden Error When Running SSRS Reports from Azure Web App within VNet

Question

Hello

I’m facing an issue with accessing SSRS reports hosted on a virtual machine from an Azure Web App . The database on a separate managed instance the SSRS is on a VM with access done via URL for the web app.

Here’s the situation: The reports execute correctly using SQL credentials ( Managed Instance ) directly from the SSRS web page on the virtual machine.

The problem arises when trying to access the SSRS reports using the Azure Web App with Domain user credentials (VM) via URL, we encounter the following error:

System.Net.WebException: The remote server returned an error: (403) Forbidden.

Currently we are using an admin level username and password to connect the web app to the SSRS VM to access the reports for the application connected to the SSRS. (As note Were not applying any domain or machine name as part of the credentials)

The Web app has access to the VM reports using private DNS and NSG ( we are using port 80 as were not at the point of using the SSL yet )

Were not sure why the user does have permission to access the report(s) when were using an admin level user account to create the connection. Any insights or suggestions would be greatly appreciated.

Checked ports,permissions,connections

Answer 1

Thanks for posting your question in the Microsoft Q&A forum.

Here are some potential solutions and suggestions based on the information provided:

• Ensure that the SSRS instance on the VM is configured to allow access from the Azure Web App.
• Instead of using domain user credentials, consider using a managed identity or service principal to authenticate the Azure Web App to the SSRS instance on the VM. This can help avoid permission issues and provide a more secure authentication method.
• Verify that the Network Security Group (NSG) rules on the VM and the Azure Web App are configured correctly to allow the necessary inbound and outbound traffic for the SSRS connection.

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