title: The configuration section 'configsections' cannot be read because it is missing a section declaration
body: <p>I want to host a Wcf service on an IIS 10.0 on Windows Server 2016. </p>
  
  <p>My app pool is <strong><code>v2.0</code></strong> Integrated and the <code>Wcf service</code> was built with <strong><code>3.5.</code></strong> Below <code>web.config</code> gets  </p>
  
  <pre><code>The configuration section 'configsections' cannot be read because it is missing a section declaration. 
  </code></pre>
  
  <p>Service runs fine with same config on a <strong>w8.1 - IIS6.2</strong> and on <code>older Windows Server versions</code>. What could be missing?</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;configuration&gt;
    &lt;configsections&gt;
       &lt;sectiongroup name="system.web.extensions" type="system.web.configuration.systemwebextensionssectiongroup, system.web.extensions, version=3.5.0.0, culture=neutral, publickeytoken=31bf3856ad364e35"&gt;
         &lt;sectiongroup name="scripting" type="system.web.configuration.scriptingsectiongroup, system.web.extensions, version=3.5.0.0, culture=neutral, publickeytoken=31bf3856ad364e35"&gt;
         &lt;/sectiongroup&gt;
      &lt;/sectiongroup&gt;
  &lt;/configsections&gt;
  </code></pre>