Can't login to use WPMU on my admin page

ok just off with blue host and cURL Information 7.19.7 is installed but i’m still getting the same error and can’t login to your plugins


Your server had a problem connecting to WPMU DEV: "cURL error 6: Couldn't resolve host ''". 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?”