I am trying to login to WPMU DEV DASHBOARD Plugin, and this is the error showing up:

Your server had a problem connecting to WPMU DEV: "HTTP Error: 403 "Forbidden"". 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?

I've consulted my hosting provider, they say the problem is from the plugin developers. Please help me to resolve as I need to activate some plugins ASAP...

My Server IP:
PHP Version: 5.4