title: Upload of files fails in IE 9 / 10
body: <p>I have the following problem:</p>
  
  <p>On a website I'm coding for a client I have a form where you can upload images (up to 5, seperate file-input elements (so no problem caused by a flash / javascript solution)).
  But sometimes the upload fails directly (nearly instantly the "Page cannot be displayed"-page is shown) or the request does not contain the files.</p>
  
  <p>This is not an issue of file-size (as it happens sometimes, no matter if the files are larger (~2-3MB) or really small (150kB)) or request timeout (as the upload fails directly and not always - but too often ;-)).</p>
  
  <p>Another weird thing: I tried to analyze the whole thing using Fiddler. But while using Fiddler the problem simply does not occur.</p>
  
  <p>Any ideas?</p>
  
  <p>Tested in IE9/10 on Win7/8<br>
  Chrome, FF etc. work fine, of course ;-)</p>
  
  <p>/edit: I use a really simple test script (fails like the regular webapp)</p>
  
  <pre><code>&lt;?='&lt;!DOCTYPE html&gt;'?&gt;
  &lt;html&gt;
  &lt;head&gt;
      &lt;title&gt;Upload Test&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;
      &lt;form action="http://www.site.com/upl-test/index.php" method="post"     enctype="multipart/form-data"&gt;
          &lt;input type="file" name="img_file0" /&gt;
          &lt;input type="file" name="img_file1" /&gt;
          &lt;input type="file" name="img_file2" /&gt;
          &lt;input type="file" name="img_file3" /&gt;
          &lt;input type="file" name="img_file4" /&gt;
          &lt;input type="submit" name="submit_btn" value="Upload" /&gt;
      &lt;/form&gt;
      &lt;?php 
      if(!empty($_FILES)){
          echo '&lt;hr /&gt;&lt;pre&gt;';
          var_dump($_FILES);
          echo '&lt;/pre&gt;';
      }
      ?&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>