Error: Web.config registration missing! The Telerik dialogs require a HttpHandler registration in the web.config file

[Vinoth Arun]

PROBLEM
Error: Web.config registration missing! The Telerik dialogs require a HttpHandler registration in the web.config file.

My Web Config;

<modules runAllManagedModulesForAllRequests="true" >

      <add type="URLRewriter.ModuleRewriter, URLRewriter" name="ModuleRewriter" />

      <add name="RadUploadModule" type="Telerik.Web.UI.RadUploadHttpModule, Telerik.Web.UI" />

    </modules>

    <handlers>

      <remove name="WebServiceHandlerFactory-Integrated" />

      <remove name="ScriptHandlerFactory" />

      <remove name="ScriptHandlerFactoryAppServices" />

      <remove name="ScriptResource" />

      <remove name="ChartImageHandler" />

 

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

      <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="ChartImageHandler" preCondition="integratedMode" verb="GET,HEAD,POST" path="ChartImg.axd" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />

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

    </handlers>

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

    </httpHandlers>

[Rumen]

Hi,

My suggestion is to:

1. open the web.config file and replace all Telerik.Web.UI.DialogHandler.aspx instances with Telerik.Web.UI.DialogHandler.axd
2. and set the RadEditor's DialogHandlerUrl property to "~/Telerik.Web.UI.DialogHandler.axd"

All the best,
Rumen
the Telerik team

[Jon]

This made me get 404 instead of 403.1

[Jon]

Sorry, I had forgotten to deploy. This works well.

[WEBSRFR]

I just had the same issue with the following error message and I have attached an image of the error message. 

"Web.config registration missing! The Telerik dialogs require a HttpHandler registration in the web.config file."

The instructions on the thread saved me as I was able to make the error go away after opening the web.config file and replacing all Telerik.Web.UI.DialogHandler.aspx instances with Telerik.Web.UI.DialogHandler.axd and then setting the RadEditor's DialogHandlerUrl property to "~/Telerik.Web.UI.DialogHandler.axd"

I am confused why I received this error message though as I have a default and unchanged latest build of the ASP.Net AJAX controls. Is something wrong with my installation that I had to change these settings for the Editor dialogs to work or do these settings need to be changed on every Telerik Controls installation?

[Ianko]

Hello,

It depends on the situation. Basically, this happens when the URL (the root path) has been dynamically  changed. For example:

• Usage of URL rewriter;
• In SharePoint;
• In other CMS application.

Regards,

Ianko
Telerik

 

 

[WEBSRFR]

This work around is going to become increasingly popular I think because just like Bootstrap, friendly URLs are now becoming a part of default ASP.net projects. Would be great if the next build by default would support Friendly URLs without needing changes.

[Ianko]

Hi,

Friendly URL matter is not something that can be enabled or configured when it comes to handlers or requests made by the controls.

URL rewrites are a matter of application configuration/implementation and it is up to the developer to configure the URL rewriter module to exclude the e.g., *.axd handler requests or any other type of requests that may lead to such problems.

In the process of controls development, what would be the technique used to intercept a possible URL rewrite and possibly correct it as per to the control needs? Such automatic interaction would be rather faulty as there is no common approach to create friendly URLs, this is rather manually configuration approach which depends on the project and the project's requirements.

Regards,
Ianko
Telerik

 

 

[Preksha]

Recently we upgraded our Sitecore website from 8.0 to 8.2. Previously everything was working fine but after upgrading it started giving error while adding hyperlink in Rich Text Editor. When we click on "Show Editor" of Rich Text Editor and then Hyperlink Manager to add link there is pop up which gives error:

"Web.config registration missing! The Telerik dialogue requires a HttpHandler registration

[Rumen]

Hello Preksha,

Please, report all Sitecore related configuration issues to Sitecore support.

Regards,
Rumen
Telerik by Progress

[Ravi]

Hi 

I am facing a similar issue with RadEditor. Its not working while debugging on local. Here are the settings of Web.Config & RadEdito Control settings. When I click on RadEditor "Paste fromWord, strip font" icon, a Popup is coming which says" local host refused to connect"

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

....

  <system.web>
    <httpRuntime maxRequestLength="102400" executionTimeout="3600" targetFramework="4.5" requestValidationMode="4.5"/>
    <httpHandlers>
      <add verb="GET" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler" validate="false"/>
      <add path="Reserved.ReportViewerWebControl.axd" verb="*" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" validate="false"/>
      <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false"/>
      <add path="Telerik.Web.UI.DialogHandler.axd" type="Telerik.Web.UI.DialogHandler" verb="*" validate="false"/>
    </httpHandlers>

 

 

     <telerik:RadEditor ID="RadEditor1" runat="server" ShowSubmitCancelButtons="False" DialogHandlerUrl ="~/Telerik.Web.UI.DialogHandler.axd"
                            EnableResize="false" Width="100%"  ToolsFile="~/WebCommon/Inc/_xml/EmailToolsFile.xml"
                            ConvertToXhtml="true" OnClientLoad="util.SetRadEditorColor">
                        </telerik:RadEditor>

Can you please let me know whats the fix to resolve this?

 

Regards

Ravi

 

 

 

 

[Attila Antal]

Hi Ravi,

Based on the screenshot, I assume this issue is seen when using the RadEditor in SharePoint, is that correct? If so, could you share the version of SharePoint as well as the version of Telerik controls used?

Kind regards,
Attila Antal
Progress Telerik

[Ravi]

Hi Attila ,

 

No, this is not a sharepoint site. Its a normal Asp.net website.

 

Regards

Ravi

[Ravi]

Hi Attila 

 

The Telerik Version I am using is 2018.1.117.45.

Regards

Ravi

[Ravi]

Hi Attila 

The Telerik version I am using is 2018.1.117.45.

Regards

Ravi

[Attila Antal]

Hi Ravi,

In general, if either the handlers or the httpHandlers were missing/incorrect in the web.config file, you would receive an error message of 404 saying the "The resource cannot be found". The error "localhost refused to connect" seems to be a problem that occurs within Visual Studio. By searching for this specific error, I found that several people recommend deleting the .vs folder within the Project which contains some settings. The file will be re-generated once Visual Studio is opened.

You may try to move that folder in a safe place and see if that helps. Here is one example: Re: getting error This site can’t be reached localhost refused to connect
See also: localhost refused to connect Error in visual studio.

You can also try the following handlers and httpHandlers declarations which work for me (attached you can find the entire project, you can download and test to see if that works):

httpHandlers

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

handlers

<handlers>
  <remove name="ChartImage_axd" />
  <add name="ChartImage_axd" path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" preCondition="integratedMode" />
  <remove name="Telerik_Web_UI_SpellCheckHandler_axd" />
  <add name="Telerik_Web_UI_SpellCheckHandler_axd" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" preCondition="integratedMode" />
  <remove name="Telerik_Web_UI_DialogHandler_aspx" />
  <add name="Telerik_Web_UI_DialogHandler_aspx" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" preCondition="integratedMode" />
  <remove name="Telerik_RadUploadProgressHandler_ashx" />
  <add name="Telerik_RadUploadProgressHandler_ashx" path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" preCondition="integratedMode" />
  <remove name="Telerik_Web_UI_WebResource_axd" />
  <add name="Telerik_Web_UI_WebResource_axd" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" preCondition="integratedMode" />
</handlers>

Kind regards,
Attila Antal
Progress Telerik

[Ravi]

Hi Attila,

I looked your code & incorporated the same in my project. Now I am not seeing the dialog box saying" require a Http handler registration" but when i click on option "strip from word, no font" i am still seeing the popup saying "local host refused to connect". I already tried the steps you mentioned in earlier thread but no success.

For your reference I am attaching a Web.config for the same.

Can you please let me know where I am doing something wrong.

I am using the following version: Telerik.Web.UI, Version=2018.1.117.45

Regards

Ravi

 

 

<?xml version="1.0"?>
<!-- 
    Note: As an alternative to hand editing this file you can use the 
    web admin tool to configure settings for your application. Use
    the Website->Asp.Net Configuration option in Visual Studio.
    A full list of settings and comments can be found in 
    machine.config.comments usually located in  
    \Windows\Microsoft.Net\Framework\v2.x\Config 
-->
<configuration>

  <!--
    For a description of web.config changes see http://go.microsoft.com/fwlink/?LinkId=235367.

    The following attributes can be set on the <httpRuntime> tag.
      <system.Web>
        <httpRuntime targetFramework="4.5" />
      </system.Web>
  -->
  <system.web>
    <httpRuntime maxRequestLength="102400" executionTimeout="3600" targetFramework="4.5" requestValidationMode="4.5"/>
    <httpHandlers>
      <add path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" 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"/>
      <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false"/>
    </httpHandlers>
    <!-- 
            Set compilation debug="true" to insert debugging 
            symbols into the compiled page. Because this 
            affects performance, set this value to true only 
            during development.
        -->
    <compilation debug="true" defaultLanguage="c#" targetFramework="4.7.1">      
      <assemblies>
        <add assembly="System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <add assembly="System.IdentityModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
        <add assembly="System.IdentityModel.Services, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
      </assemblies>
      <buildProviders>
        <add extension=".rdlc" type="Microsoft.Reporting.RdlBuildProvider, Microsoft.ReportViewer.Common, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
      </buildProviders>
    </compilation>
    <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">
      <controls>
        <add tagPrefix="telerik" namespace="Telerik.Web.UI" assembly="Telerik.Web.UI, Version=2018.1.117.45, Culture=neutral, PublicKeyToken=121fae78165ba3d4"/>        
      </controls>
    </pages>
    <sessionState timeout="1440"/>
  </system.web>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true">
      <remove name="FormsAuthentication"/>
    </modules>
    <validation validateIntegratedModeConfiguration="false"/>
      <handlers>
        <remove name="ChartImage_axd"/>
        <add name="ChartImage_axd" path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" preCondition="integratedMode"/>
        <remove name="Telerik_Web_UI_SpellCheckHandler_axd"/>
        <add name="Telerik_Web_UI_SpellCheckHandler_axd" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" preCondition="integratedMode"/>
        <remove name="Telerik_Web_UI_DialogHandler_aspx"/>
        <add name="Telerik_Web_UI_DialogHandler_aspx" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" preCondition="integratedMode"/>
        <remove name="Telerik_RadUploadProgressHandler_ashx"/>
        <add name="Telerik_RadUploadProgressHandler_ashx" path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" preCondition="integratedMode"/>
        <remove name="Telerik_Web_UI_WebResource_axd"/>
        <add name="Telerik_Web_UI_WebResource_axd" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" preCondition="integratedMode"/>
    </handlers>
    <httpProtocol>
      <customHeaders>
        <clear/>
        <add name="X-UA-Compatible" value="IE=Edge"/>
        <add name="X-XSS-Protection" value="1"/>
        <add name="X-Frame-Options" value="DENY"/>
      </customHeaders>
    </httpProtocol>
    
  </system.webServer>

  <location path="Telerik.Web.UI.WebResource.axd">
    <system.web>
      <authorization>
        <allow users="*" />
      </authorization>
    </system.web>
  </location>
 
</configuration>

 

[Attila Antal]

Hi Ravi,

I have tested the Web config file you've shared and I found that the following custom header was preventing the RadEditor's Popups to load:

<add name="X-Frame-Options" value="DENY"/>

RadEditor highly relies on RadWindows to bring up the tools and some windows may render as an iFrame and if this is blocked, they can't load the content. You can fix the error by commenting out the X-Frame-Options custom header from the web.config file.

<httpProtocol>
  <customHeaders>
    <clear/>
    <add name="X-UA-Compatible" value="IE=Edge"/>
    <add name="X-XSS-Protection" value="1"/>
    <!--<add name="X-Frame-Options" value="DENY"/>-->
  </customHeaders>
</httpProtocol>

I hope this will prove helpful.

Kind regards,
Attila Antal
Progress Telerik