My Summary (or Summary large image) twitter cards have suddenly stopped working for my blog. They used to work just fine until around a couple of weeks ago. They just won’t show on Twitter when the link is placed.
Tha validator always returns a “Server Error” message for any URL with the Markup, and when I use the “Try Cards” manually entering the information and URLs I get a “Failed to get a proxied URL for the image” message.
Here’s a page with the usual markup (the one I’ve been using all this time and worked 'til now)
I know there are similar issues for many users, but just cheking just in case is a problema with my server, or DNS, or Domain, even though the site seems to be working proprerly, because I’m getting a similar result on other sharing services like G+. I even modified my robots.txt to cover all Twitter related things, here’s the URL http://www.hercios.es/robots.txt