dev dashboard not working on localhost

Hi!
I'm new here and I installed the DEV Dashboard on my own machine on a Mac using MAMP but can't register my API. After I enter my login/password info, I get this error:
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?"

is it something specific to localhost and is there a way to make it work?