"HTTP Error: 403 "Forbidden"

Good morning, I've uploaded the plugin onto my multiSite website under the main site. However, when choosing to activate it I'm getting the error code 403. I've contacted HOSTGATOR, and they have informed me that the problem is verifying on your end.
Also, when attempting to confirm my email and password through site for activation this error continues to stop the process. Please advise, or repair? They have tried searching for the Curly etc with no luck.

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?"