Why ReportViewer Control not working on IIS 7?

Why ReportViewer Control not working on IIS 7?


  •  Unable to render ReportViewer in ASP.NET Web Pages while running on IIS7.
  •  You are able to view your reports on Report Manager as well as while you are debugging locally  but not able to view them on IIS7.
  •  You encounter JavaScript error when loading your report page with ReportViewer. Image buttons such as calendar appear as red ‘X’.


  • When you add ReportViewer control is into web page(.aspx), the
    Reserved.ReportViewerWebControl.axd httpHandler is added to System.Web section of the Web.Config file. In IIS7, It should be added under System.WebServer section.
  • IIS7  Handler Mappings doesn’t contain Reserved.ReportViewerWebControl.axd httpHandler, and that’s why not able to render the some ReportViewer elements which is needed by the JavaScript.

Solution : 

1. Open Internet Information Services (IIS) Manger and select Default Web Site.

2. Under IIS Section, Double click on Handler Mappings.

1-Why ReportViewer Control not working on IIS 7

3. From Action Pane (Right Side of Handler Mappings Section), click on Add Managed Handler.

2-Why ReportViewer Control not working on IIS 7

4. Add Managed Handler dialog opens. In that, enter following values.

Request Path : Reserved.ReportViewerWebControl.axd

Type :Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a

Name : Reserved-ReportViewerWebControl-axd

3-Why ReportViewer Control not working on IIS 7

Then click on OK button.

Reserved-ReportViewerWebControl-axd handler is now added to your Handler Mappings list. Also notice that the following line has also been added to your application’s Web.config file under the system.webserver’s handler section:

<add name=”Reserved-ReportViewerWebControl-axd” path=”Reserved.ReportViewerWebControl.axd” verb=”*” type=”Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a” resourceType=”Unspecified” preCondition=”integratedMode” />

Now try to run your report again.

3 thoughts on “Why ReportViewer Control not working on IIS 7?

  1. Very useful article, it saved my life. But take something on mind: in the screenshot of the Add Managed Handler dialog you can see “ReportViewerWebControl”. But in the text explanation, says “ReportViewerWenControl” (with N). In my personal case, until I’ve figured out (20 minutes) it made me go nuts.

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