Dashboard Connectivity Error

I am Having this Error, when i login into site,
Also i contacted by service provider and they have enabled the CURL, still same error, Please Suggest what to do ?

Your server had a problem connecting to WPMU DEV. 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?"