Internal Server Error / CAPTCHA Errors/An Error has Occured

DNN > Troubleshooting
 
When Your DNN Site Gives You Any of These Errors: Internal Server Error / Captcha Errors/ An Error Has Occured

Issue

You may be experiencing the following issues:
  • You are receiving the following error: HTTP Error 500.21 - Internal Server Error Handler.
  • URLs that route through LinkClick.aspx stop working.
  • CAPTCHAs are no longer working on your site.
  • You recently upgraded your DNN and the new site loads and shows in red 'An error has occured' on the default or home page.

Possible Causes:
Missing or incorrect handlers are in the web.config. This is a common issue when changing the version of your ASP.NET or upgrading from DNN 5 to DNN 6. It is usually a quick fix by adding the handlers into the web.config file.

Resolution
  1. Open up the web.config file. See How to access your web.config file.
  2. Search in the web.config file for <system.webServer>. (Use Ctrl F for most programs.)
  3. Locate <system.webServer> and then find the <handlers> section.
  4. If the <Handlers> are not present insert them under the </modules> section like the below example.
  5. Replace/Add the <handlers> section with the <handlers> section of a default web.config for that version of DNN.
  6. If you do not have an available copy of a default web.config you can copy/paste the handlers section from below. They are for 6.1.3, or you could download the version you need from dotnetnuke.codeplex.com
Example: This is an example from a default web.config file for DNN 6.1.3 and the red highlighted section (the handlers) is what you would replace in your web.config if you are also running DNN 6.1.3
<system.webServer>
        <modules>
            <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" preCondition="managedHandler"/>
            <add name="Compression" type="DotNetNuke.HttpModules.Compression.CompressionModule, DotNetNuke.HttpModules" preCondition="managedHandler"/>
            <add name="RequestFilter" type="DotNetNuke.HttpModules.RequestFilter.RequestFilterModule, DotNetNuke.HttpModules" preCondition="managedHandler"/>
            <add name="UrlRewrite" type="DotNetNuke.HttpModules.UrlRewriteModule, DotNetNuke.HttpModules" preCondition="managedHandler"/>
      <add name="MobileRedirect" type="DotNetNuke.HttpModules.MobileRedirectModule, DotNetNuke.HttpModules" preCondition="managedHandler"/>
            <add name="Exception" type="DotNetNuke.HttpModules.Exceptions.ExceptionModule, DotNetNuke.HttpModules" preCondition="managedHandler"/>
            <add name="UsersOnline" type="DotNetNuke.HttpModules.UsersOnline.UsersOnlineModule, DotNetNuke.HttpModules" preCondition="managedHandler"/>
            <add name="DNNMembership" type="DotNetNuke.HttpModules.Membership.MembershipModule, DotNetNuke.HttpModules" preCondition="managedHandler"/>
            <add name="Personalization" type="DotNetNuke.HttpModules.Personalization.PersonalizationModule, DotNetNuke.HttpModules" preCondition="managedHandler"/>
            <add name="Analytics" type="DotNetNuke.HttpModules.Analytics.AnalyticsModule, DotNetNuke.HttpModules" preCondition="managedHandler"/>
            <add name="RadUploadModule" type="Telerik.Web.UI.RadUploadHttpModule, Telerik.Web.UI" preCondition="managedHandler"/>
        </modules>
        <handlers>
            <remove name="WebServiceHandlerFactory-Integrated"/>
            <add name="LogoffHandler*" path="Logoff.aspx" verb="*" type="DotNetNuke.Services.Authentication.LogOffHandler, DotNetNuke" preCondition="integratedMode"/>
            <add name="RSSHandler" path="RSS.aspx" verb="*" type="DotNetNuke.Services.Syndication.RssHandler, DotNetNuke" preCondition="integratedMode"/>
            <add name="LinkClickHandler" path="LinkClick.aspx" verb="*" type="DotNetNuke.Services.FileSystem.FileServerHandler, DotNetNuke" preCondition="integratedMode"/>
            <add name="CaptchaHandler" path="*.captcha.aspx" verb="*" type="DotNetNuke.UI.WebControls.CaptchaHandler, DotNetNuke" preCondition="integratedMode"/>
            <add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add name="ScriptResource" verb="GET,HEAD" path="ScriptResource.axd" preCondition="integratedMode" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add name="Telerik.Web.UI.WebResource" verb="*" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource, Telerik.Web.UI" preCondition="integratedMode" />
            <add name="Telerik.Web.UI.ChartHttpHandler" path="ChartImage.axd" verb="*" type="Telerik.Web.UI.ChartHttpHandler, Telerik.Web.UI, Culture=neutral, PublicKeyToken=121fae78165ba3d4" preCondition="integratedMode" />
            <add name="UserProfilePageHandler" path="User.aspx" verb="*" type="DotNetNuke.Services.UserProfile.UserProfilePageHandler, DotNetNuke" preCondition="integratedMode"/>
            <add name="HtmTemplateFileHandler" verb="*" path="*.htmtemplate" type="DotNetNuke.HtmlEditor.TelerikEditorProvider.HtmTemplateFileHandler, DotNetNuke.HtmlEditor.TelerikEditorProvider" preCondition="integratedMode" />
            <add name="RadProgressHandler" verb="*" path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.Upload.RadUploadProgressHandler, Telerik.Web.UI" preCondition="integratedMode"/>
        </handlers>
        <validation validateIntegratedModeConfiguration="false"/>
    </system.webServer>


     
 

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