I have create a ASP.net webform with a reportview control. Tested this on the IIS server and working 100%. I then, on our linux box changed the NGINX config, added a proxy_pass pointing to the IIS website hosting the asp.net form. On the linux box, is hosted a Net core 3.1 website. In this website there is an IFrame that points to the asp.net webform address. When the IFRame gets loaded, I keep getting below error – please remember it is working on IIS.

The Report Viewer Web Control HTTP Handler has not been registered in the application’s web.config file. Add to the system.web/httpHandlers section of the web.config file, or add to the system.webServer/handlers section for Internet Information Services 7 or later.

So the issue is now why does NGINX not properly read the web.config and display the control properly.

I have tested with default.aspx end the css files does not get properly loaded.

Help would be much appreciated.