Error connecting WPMU DEV dashboard

When I try to log in on the dashboard plug-in I get this error:

Your server had a problem connecting to WPMU DEV: "Operation timed out after 15001 milliseconds with 22387 bytes received" 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/wdp-un.php with a GET HTTP request via fsockopen or CURL?"

Curl is enabled.

The IP address of the server is:46.21.234.157