title: Twitter card whitelisting issues probably because URL is inaccessible to crawler
body: <p>I have been trying to get my <a href="http://www.indiaoutside.org" rel="nofollow">website</a> whitelisted for Twitter cards. Every time I apply for whitelisting I get an email saying <strong>"The URL you provided for indiaoutside.org to use the summary_image_large card is inaccessible."</strong></p>
  
  <p>I tried searching their community and found <a href="https://twittercommunity.com/t/twitter-card-not-whitelisted-because-url-is-inaccessible/37034" rel="nofollow">this</a>. It is apparent that <strong>Twitter's crawler is unable to access my website</strong>. I am running an AWS EC2 for this website. <strong>How do I find out if AWS is denying access to the web crawler and how do I change that?</strong></p>