404 Not Found Reserved.ReportViewerWebControl.axd - ReportViewer

Programming, error messages and sample code > ASP.NET
The reports can be showed. However, the icon images show errors while checking image link.

For example, it returned 404 error on
http://test-reportviewer.net/Reserved.ReportViewerWebControl.axd?OpType=Resource&Version=8.0.50727.42&Name=Icons.FirstPageDisabled.gif

Solution:

Update .net application mode From Integrated to Classic, which will make http handlers working fine.