"The request failed with HTTP status 401: Unauthorized." error in report viewer section

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ASP.NET

I have a asp.net c# web application with contains SSRS reports in remote processing mode. I am using the report-viewer control to render the reports. When I run the application in debug mode, I'm able to view my reports however when I publish the application to a different server I get this error message:

The request failed with HTTP status 401: Unauthorized.

My report server is on a different server than the location of my published web application. I have added new role assignment to my report server and also added to my web.config but the error persists. I think I am missing something in my aspx page or web.config for reportviewer.