Setting up the remote update server

I am following this document "http://helpx.adobe.com/creative-cloud/packager/update-server-setup-tool.html#Preparing a web server to use as the update server"

To setup an update server on Windows Server 2012R2 which uses IIS 8.5

I have got to the bit that says "Add the httpHandles for the zip, xml, crl, dmg, and sig extension in the web.config file as shown here:"

and I have added the required statements to the web.config file. Here is my complete config file:

<configuration>

    <system.web>

        <compilation targetFramework="4.5" />

        <membership>

            <providers>

                <add name="WebAdminMembershipProvider" type="System.Web.Administration.WebAdminMembershipProvider" />

            </providers>

        </membership>

        <httpModules>

            <add name="WebAdminModule" type="System.Web.Administration.WebAdminModule"/>

        </httpModules>

        <authentication mode="Windows"/>

        <authorization>

            <deny users="?"/>

        </authorization>

        <identity impersonate="true"/>

       <trust level="Full"/>

       <pages validateRequest="true"/>

       <globalization uiCulture="auto:en-US" />

           <httphandlers>

             <add path="*.zip" verb="*" type="system.web.staticfilehandler" />

             <add path="*.xml" verb="*" type="system.web.staticfilehandler" />

             <add path="*.crl" verb="*" type="system.web.staticfilehandler" />

             <add path="*.dmg" verb="*" type="system.web.staticfilehandler" />

             <add path="*.sig" verb="*" type="system.web.staticfilehandler" />

           </httphandlers>

    </system.web>

    <system.webServer>

        <modules>

            <add name="WebAdminModule" type="System.Web.Administration.WebAdminModule" preCondition="managedHandler" />

        </modules>

        <validation validateIntegratedModeConfiguration="false" />

    </system.webServer>

</configuration>

When I try to browse the web site I get an error page, showing this message: "The configuration section 'httphandlers' cannot be read because it is missing a section declaration"

Clearly I have a silly error in the config file, but I am new to all this stuff - infrastructure networks and servers are more my thing.

Can someone point out my no-doubt-obvious mistake?

Thanks,