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?"
I have my own server with php info parameter
allow_url_fopen On and On
cURL support enabled
cURL Information = 7.15.5