cURL error 6: name lookup timed out

I installed the WPMU Dev plugin on my wordpress blog at wobbin.com. But when I try to sign in to my account I get the following error:

Your server had a problem connecting to WPMU DEV: "cURL error 6: name lookup timed out". Please try again.

If this problem continues, please contact your host with this error message and ask:

"Is php on my server properly configured to be able to contact https://premium.wpmudev.org/api/dashboard/v1/ with a POST HTTP request via fsockopen or CURL?"

What is the issue here? Thanks