500.21 Bad module "ManagedPipelineHandler" in its module list

Question

I am getting the error:

HTTP Error 500.21 - Internal Server Error Handler "CloudConnectHandler" has a bad module "ManagedPipelineHandler" in its module list

my web.config file looks like this:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.webServer>
    <handlers>
      <add name="CloudConnectHandler" verb="*" path="CloudConnect.aspx" type="CloudConnectHandler" resourceType="Unspecified" />
    </handlers>
  </system.webServer>
  <system.web>
    <customErrors mode="Off" />
    <compilation debug="true" targetFramework="4.0" batch="false">
      <assemblies>
        <add assembly="System.Xml.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
        <add assembly="System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
        <add assembly="Microsoft.CSharp, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
      </assemblies>
    </compilation>
    <pages>
      <controls>
        <add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />
      </controls>
    </pages>
        <identity impersonate="true" />
        <authentication mode="Forms" />
  </system.web>
  <system.codedom>
    <compilers>
      <compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
        <providerOption name="CompilerVersion" value="v4.0" />
        <providerOption name="WarnAsError" value="false" />
      </compiler>
    </compilers>
  </system.codedom>
  <appSettings>
    <add key="CloudConnectAuthorization" value="xxxx" />
    <add key="ConnectionInfo" value="xxxx" />
    <add key="ConnectionString" value="xxxx" />
    <add key="DefaultChannel" value="xxxx" />
    <add key="LoginValidationConnectionString" value="xxxx" />
  </appSettings>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="protobuf-net" publicKeyToken="257b51d87d2e4d67" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-2.0.0.640" newVersion="2.0.0.640" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

There is a lot of advice out there indicating that asp.net is not installed correctly. The usual fix is to run:

%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -i

or

%windir%\Microsoft.NET\Framework\v4.0.21006\aspnet_regiis.exe -i

I have run both, without any errors. I have restarted IIS, but the problem still persists. The site is using an application pool. The app pool is started, .net framework = 4.0, Managed Pipeline = Classic, Identity = LocalSystem.

I've spent the last couple hours trying to figure out what the problem is. I'm hoping someone can help.

Answer 1

Please follow these steps:

1) Run the command prompt as administrator.

2) Type either of the two lines below in the command prompt:

%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i

or

%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_regiis.exe -i