Opengraph tags stopped working after server migration

Hello,

I always used Facebook to share my blog posts and the OpenGraph tags always worked correctly, but after a server migration (the only thing that changed), Facebook don’t see my OG tags anymore, title, thumbnail, nothing.

I tried to debug via https://developers.facebook.com/tools/debug/‎ but I get a 206 code and the error: It was not possible to download.

My site is working fine and loading correcly, no complaints about that. I tried to deactivate the W3 Total Cache plugin, thinking that facebook could be getting a “outdated cached version of my site”, but nothing changed.

Here is a example of my OG tags, generated automatically by the Yoast WordPress SEO plugin:

<meta name="description" content="&quot;Planta Stevia&quot; Se você conhece os malefícios do açúcar, está em cutting, ou simplesmente quer viver mais tempo neste planeta, provavelmente você considero"/>
<meta name="keywords" content="stevia, , Dieta e Nutrição"/>
<link rel="canonical" href="http://www.hipertrofia.org/blog/2014/03/24/adocante-stevia-uma-opcao-mais-segura/"/>
<meta property="og:locale" content="pt_BR"/>
<meta property="og:type" content="article"/>
<meta property="og:title" content="Adoçante Stevia: uma opção mais segura"/>
<meta property="og:description" content="&quot;Planta Stevia&quot; Se você conhece os malefícios do açúcar, está em cutting, ou simplesmente quer viver mais tempo neste planeta, provavelmente você considero"/>
<meta property="og:url" content="http://www.hipertrofia.org/blog/2014/03/24/adocante-stevia-uma-opcao-mais-segura/"/>
<meta property="og:site_name" content="Hipertrofia.org"/>
<meta property="article:section" content="Dieta e Nutrição"/>
<meta property="article:published_time" content="2014-03-24T10:18:48+00:00"/>
<meta property="article:modified_time" content="2014-03-24T10:20:39+00:00"/>
<meta property="og:updated_time" content="2014-03-24T10:20:39+00:00"/>
<meta property="og:image" content="http://zonablog.hipertrofia.netdna-cdn.com/blog/wp-content/uploads/2014/03/plata-stevia-1024x682.jpg"/>

Any help would be great!

Thank you