My server had a problem connecting to WPMU DEV

I just register to be a paid member. While installing WPMU DEV Dashboard, it showed these word and I can't login to my WPMU account inside my wordspress network admin dashborad. I am using a share host with Hostgator.com

Your server had a problem connecting to WPMU DEV: "Operation timed out after 15003 milliseconds with 0 bytes received" Please try again.
If this problem continues, please contact your host and ask:
"Is php on my server properly configured to be able to contact https://premium.wpmudev.org/wdp-un.php with a GET HTTP request via fsockopen or CURL?"