unable to connect to wpmudev

Hello,

I'm trying to connect two websites but they are both unable to connect. \

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Your server had a problem connecting to WPMU DEV: "cURL error 28: Operation timed out after 15001 milliseconds with 0 out of -1 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/api/dashboard/v1/ with a POST HTTP request via fsockopen or CURL?"
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cURL is working fine and to be sure I'm trying to connect on 2 totally different servers.

Whats wrong?

Thanks,
Maarten