error during verification / activation for new website

I'm getting this message when trying to activate? I've done this many times, same server setups, not sure if the problem is on my end.

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 with a POST HTTP request via fsockopen or CURL?"