Cannot login into WPMU Dev Dashboard

Hey there, I am not able to login into WPMU Dev Dashboard.
Getting the following error when trying to log in:

"Your server had a problem connecting to WPMU DEV: "cURL error 6: Could not resolve host: premium.wpmudev.org". Please try again."

Checked in phpinfo(), the CURL is enabled. Searched in forums, couldn't find any other solution.
Deleted all other plugins, and activated the wordpress default theme, but still having that error.

Could you, please help me?
Thanks in advance