Keeg getting Internal server error



We keep getting an internal server error while validating our Summary Card for a while now.
What can this be?

A link to our blog:

Thanks in advance!


I see the following error for

Fetching the page failed because the fetcher cannot resolve the address.

In some cases, a hosting site will block our servers. Where are you hosting your site? Can you contact them and give them this information?

Your web host may be blocking web crawler access to your site. You should contact your hosting provider and ask them to ensure they are not blocking Twitter access by either IP or ASNUM. You can also provide the following information to help them enable access:
Twitter IPs:
Twitter ASNUM: AS13414