I have recently put up my PirateBox network and I can use the discussion board to chat with others. The only problem is that when I try to upload files, I get an image like this . I used the developer tools to inspect it and this was the HTML

Language: HTML
<div id="sub-frame-error" jstcache="0">
    <!-- Show details when hovering over the icon, in case the details are
         hidden because they';re too large. -->
    <div class="icon icon-generic" jseval="updateIconClass(this.classList, iconClass)" jstcache="1"></div>
    <div id="sub-frame-error-details" jsselect="summary" jsvalues=".innerHTML:msg" jstcache="2">The connection was reset.</div>
  </div>

I get no JavaScript errors. If there is something that I haven't explained, please tell me and I will. I hope someone can help.