View Full Version : Report Viewer - 404 Error - File or directory not found

January 5th, 2012, 08:55 AM
When utilizing ASP.NET Report Viewer you may receive a 404 File or directory not found error. This is because the managed handler is missing in IIS for the domain serving your .NET application.

To resolve this issue:

Open IIS 7 or 7.5
Select the site to modify by double clicking, revealing all options.
Double click on Handler Mappings
Click Add Managed Handler
Request path: Reserved.ReportViewerWebControl.axd
Type: Microsoft.Reporting.WebForms.HttpHandler
Name: Reserved-ReportViewerWebControl-axd
Click OK to complete

Refresh the application or web page using the Report Viewer, it should work properly now.