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Asked: 2026-05-30T11:43:12+00:00

I’m using a Telerik RadChart control on my ASP.NET web application. This works fine

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I’m using a Telerik RadChart control on my ASP.NET web application.

This works fine when running on localhost, but now the application has been deployed to IIS7 and the following error appears:

enter image description here

Why is this? And how can I resolve the issue?

I’ve seen on some forum posts that the solution is to add the following into <system.webServer> in the web.config:

<add name="ChartImage_axd" path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" preCondition="integratedMode,runtimeVersionv2.0"/>

However, I have already done this, and the error is still appearing.

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1 Answer

  1. Editorial Team

    I had the same problem, for IIS7 the Telerik HTTP Handlers that you have in <system.web> <httphandlers> need to be in <system.webServer><handlers>

    I’m not sure if you should remove from system.web but just copy over your telerik http handler
    for rad chart, should look something like this:

    <add path="ChartImage.axd" verb="*" type="Telerik.Web.UI.ChartHttpHandler, Telerik.Web.UI, Version=2011.3.1305.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4" validate="false" />
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