Site connection not working.

I have a problem with the wpmudev connection to the hub. If I try to login I get this error:

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?”

The fsockopen is enabled, WPMU DEV IPs are whitelisted, Curl version 7.55.1.

It was working before, can you help me?