Fix to Report viewer problems in IIS 7 or later

When we migrate web applications from IIS 6 to IIS 7 or IIS 7.5, we will face some problems in http handlers, mappings etc. I faced some problems with reportviewer control. So, below are all problems I have faced and solutions to them. And one more thing is, the server to which we migrated the application may or may not have all the report viewer dlls available in the system. If they didn't install then we need to install them. Otherwise you will get compilation error as we are using that in our application.

First of all, before proceed what are the dlls needed for the report viewer to run?
Microsoft.reportviewer.common.dll
Microsoft.reportviewer.processingobject.dll
Microsoft.reportviewer.webforms.dll
Microsoft.reportviewer.winforms.dll - For windows applications.

So, to get the dlls you need to install the redistributable packages for 2005/2008. Below are details to get that. Find the matched version[2005/2008] and isntall the correct patch. Once installed you will find all above dlls in the GAC.

Microsoft Report Viewer Redistributable 2008
File name : ReportViewer.exe
Version : 9.00.21022.08
Download Size : 2.8 MB

Microsoft Report Viewer Redistributable 2005
File name : ReportViewer.exe
Version : 2007
Download Size : 1.8 MB

Microsoft Report Viewer Redistributable 2005 SP1 (Upgrade)
File name : VS80-KB933137-X86.exe
Version : 1
Download Size : 1.7 MB

Microsoft Report Viewer Redistributable 2005 SP1 (Full Installation)
File name : ReportViewer.exe
Version : 1.0
Download Size : 1.8 MB

ReportViewer Samples for Microsoft Visual Studio 2008
File name : ReportViewerSamples2008.exe
Version : 1.0
Download Size : 172 KB

ReportViewer Samples for Visual Studio 2005
File name : ReportViewerSamples.exe
Version : 1.0
Download Size : 173 KB

With the installed patch, you can solve the compilation error. But, the report viewer control won't render correctly on the browser. What are the possible problems come?

1. 'RSClientController' is undefined
2. Report resource images are not coming or loading.
3. RSParamaters  not defined.
4. ReportViewerHoverButton not defined etc...
5. Other javascript errors which caused the report viewer failed to load correct.

The only fix to the problems are below.
Solution:
We need to configure the report viewer auto generated axd files[Reserved.ReportViewerWebControl.axd] in the IIS.
See below pictures to understand it well.
1. Open the IIS by typing the "inetmgr" in run command.
2. Goto your site in the list of web sites and select it as shown below.

3. Now, see the Features view area. Here, you can see all options available for the web site. From all the options select "Handler Mappings".

4.  Now, click on the "Handler Mappings" section then you will see all the mappings applied for that web site. Now, on the right side panel, you are able to see all the options available for the handler mappings. Select the option "Add Managed Handler" as shown below.

5. When you click that link, you will see a popup window with the text boxes as shown below.
Fill, Path = Reserved.ReportViewerWebControl.axd,
Type = Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Name= Reserved.ReportViewerWebControl.axd

Note: Please change the version number[9.0.0.0] in the Type above given depends on your requirement.
6. Click OK and do IISRESET.
Now, browse the page where you have report viewer control. And you see no more issues and everything renders fine. Hope this will help you to understand well and please let me know, if you have any questions or issues.