Error when trying to login to WPMU Dashboard

Not sure why I was logged out on this particular site,

But when trying to login again, getting this error:

Your server had a problem connecting to WPMU DEV: "cURL error 6: Resolving host 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 with a POST HTTP request via fsockopen or CURL?"