'~/Telerik.Web.UI.WebResource.axd' is missing in web.config

6 Answers 11415 Views

Editor

Jo asked on 11 Sep 2012, 02:25 PM

I get this error using Sitecore:

'~/Telerik.Web.UI.WebResource.axd' is missing in web.config. RadScriptManager requires a HttpHandler registration in web.config. Please, use the control Smart Tag to add the handler automatically, or see the help for more information: Controls > RadScriptManager

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: '~/Telerik.Web.UI.WebResource.axd' is missing in web.config. RadScriptManager requires a HttpHandler registration in web.config. Please, use the control Smart Tag to add the handler automatically, or see the help for more information: Controls > RadScriptManager

Source Error:

An unhandled exception was generated during the execution of the
            current web request. Information regarding the origin and location of the
            exception can be identified using the exception stack trace below.

Stack Trace:


            [InvalidOperationException: '~/Telerik.Web.UI.WebResource.axd' is missing in web.config. RadScriptManager requires a HttpHandler registration in web.config. Please, use the control Smart Tag to add the handler automatically, or see the help for more information: Controls > RadScriptManager]
   Telerik.Web.UI.RadScriptManager.OnPreRender(EventArgs e) +161
   System.Web.UI.Control.PreRenderRecursiveInternal() +80
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842

I have tried adding lines like this with the correct versions for my DLLs:
<add verb="*" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource, Telerik.Web.UI, Version=2010.2.826.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4" validate="false" />

I have this at the moment:
<add verb="*" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" />

If I create a blank page and drag the control on from my toolbox I get a red message on it saying 'Error Cannot render control' so I can't get it to auto add the necessary stuff into the web.config.

This works across our sites and on my colleagues computers but not mine.

What is missing?

6 Answers, 1 is accepted

answered on 11 Sep 2012, 02:39 PM

Hi,

These are the handlers needed for RadEditor and RadScriptManager:

<httpHandlers>
      <add path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" validate="false"/>
      <add path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" validate="false"/>
      <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false"/>
</httpHandlers>

and

<system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
    <validation validateIntegratedModeConfiguration="false"/>
    <handlers>
      <add name="Telerik_Web_UI_DialogHandler_aspx" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler"/>
      <add name="Telerik_Web_UI_SpellCheckHandler_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler"/>
      <add name="Telerik_Web_UI_WebResource_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource"/>
    </handlers>
</system.webServer>

It is not needed to specify fully qualified names and I do not recommend you to set them to avoid versioning problems.

All the best,
Rumen
the Telerik team

If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed now.

commented on 11 Sep 2012, 03:27 PM

I tried these with no luck - I get exactly the same error. It was pretty much what we had anyway.

Would there be anything else that would be causing this?

commented on 12 Sep 2012, 11:51 AM

Still broken - any ideas!?

Frank

commented on 03 Oct 2023, 08:17 PM

This thread is a bit old but just maybe this will help someone. The instructions above do work but the directions were not clear or complete. The first part has to be put under the configuration/system.web section to work properly. Here's a snapshot of an example web.config file for reference.

<?xml version="1.0"?>
<configuration>

  <connectionStrings>
    <add name="NorthWindConnectionString" connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\Northwind.mdf;Integrated Security=True;Connect Timeout=30"
      providerName="System.Data.SqlClient" />
  </connectionStrings>
  <system.web>
    <compilation debug="true" targetFramework="4.7.2" />
    <httpRuntime targetFramework="4.7.2" />
    <httpHandlers>
      <add path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" validate="false"/>
      <add path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" validate="false"/>
      <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false"/>
    </httpHandlers>

  </system.web>

  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
    <validation validateIntegratedModeConfiguration="false"/>
    <handlers>
      <add name="Telerik_Web_UI_DialogHandler_aspx" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler"/>
      <add name="Telerik_Web_UI_SpellCheckHandler_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler"/>
      <add name="Telerik_Web_UI_WebResource_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource"/>
    </handlers>
  </system.webServer>

</configuration>

Rumen

commented on 04 Oct 2023, 06:38 AM

Thank you for the clarification, Frank! Much appreciated! I'd like to also share the following resource on the topic:

Configuring Mandatory Additions

which shows the handlers' configuration needed for the Telerik AJAX components.

Cameron

commented on 19 May 2025, 08:02 PM

Perfect, thank you Frank.

answered on 12 Sep 2012, 01:32 PM

Hi,

You can try the following:

Add a <location> section to the application configuration file to allow access to Telerik.Web.UI.WebResource.axd to all users, like:

Copy Code

<configuration>

...

<location path="Telerik.Web.UI.WebResource.axd">

<system.web>

<authorization>

<allow users="*"/>

</authorization>

</system.web>

</location>

...

</configuration>

You can also check this forum thread on the subject: IIS7 and Telerik.Web.UI.WebResource.axd' is missing in web.config and this online resource Resolving the error: ~/Telerik.Web.UI.WebResource.axd is missing in web.config.

Regards,
Rumen
the Telerik team

commented on 13 Sep 2012, 11:12 AM

Changing from integrated to classic fixed it.

Thank you so much for the help! Very much appreciated. =)

Nhat

commented on 29 Dec 2012, 10:58 AM

Thanks Rumen
You are Genius!!

VEERANAN

commented on 15 Sep 2014, 10:35 AM

super really it is very helpful thanks

Dev

commented on 02 Sep 2015, 10:41 AM

Hi, I'm having the same issue in Sitecore. Where can I set EnableHandlerDetection to false?

Priya

commented on 24 Oct 2017, 01:21 PM

Thanks, it workd fine by using Classic mode

I added the below code

Step1: Web.config

Step2: Go to IIS,

Navigate to your application under Default WebSite

And check the adtvanced setting.

Check the Application pool & Make a note of it. (ABC)

------------------------------

Navigate to Application Pool

Select the ABC and change the managePileline mode to Classic

Everything starts working perfect

Henry Du

commented on 02 Jul 2019, 10:04 PM

Thanks. Change to integrated worked for me too. I'm not sure why.

Ianko

commented on 04 Mar 2014, 07:47 AM

Hello Daniel,

Yes, the httpHandlers should be placed in the system.web section and the handlers - in system.webServer. You can find additional information on this matter in this KB article.

Regards,
Ianko
Telerik

If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the UI for ASP.NET AJAX, subscribe to the blog feed now.

answered on 24 Jun 2014, 11:04 PM

I had added the httpHandlers and system.webServer handlers above, along with this <location> section in my web.config after running across this forum, but this was not enough.

I then installed the Telerik.Web.UI (2013_3_1015) and Telerik Extensions for ASPNET MVC (2013_2_611), and when I re-launched my web project in Visual Studio 2010, a Telerik notice saying my web.config's extensions were out of date asked if I wanted it to re-write the web.config to take advantage of the new extensions. I told the wizard to do this and checked the box to copy in the referenced DLLs to the project. I did a build, publish, and the site finally came up with no error.

I did a "diff" on the web.config from the previous version. It had the changes mentioned here, but quite a few more:

    - <compliation> tag now has strict=false and explicit=true
    - In httpHandlers, Telerik.Web.UI.WebResource.axd's type resource no longer has ", Telerik.Web.UI" in addition to "Telerik.Web.UI.WebResource" -- only the latter remains.
    - Additional httpHandlers were added:

<add path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" validate="false" />

<add path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" validate="false" />

<add path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" validate="false" />

- Additional <handlers> in <system.webServer> have been created:

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

<add name="Telerik_Web_UI_SpellCheckHandler_axd" path="Telerik.Web.UI.SpellCheckHandler.aspx" type="Telerik.Web.UI.SpellCheckHandler" verb="*" preCondition="integratedMode" />

<add name="Telerik_Web_UI_DialogHandler_aspx" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" preCondition="integratedMode" />

<add name="Telerik_RadUploadProgressHandler_ashx" path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" preCondition="integratedMode" />

<add name="Telerik_Web_UI_WebResource_axd" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" preCondition="integratedMode" />

And, at the end of <system.webServer>, this <modules> tag has been inserted:

<modules runAllManagedModulesForAllRequests="true">

<remove name="RadCompression" />

<add name="RadCompression" type="Telerik.Web.UI.RadCompression" preCondition="integratedMode" /></modules>

There were other "remove name" tags like that in the httpHandlers and system.webServer handlers for each value, too.

So you may be able to edit your web.config manually, like above, and add that <location> piece, or install the extension tools and latest Telerik.Web.UI and have the system re-write your web.config for you.

Hopefully all of this may help someone.