[WPMUDEV API Error] 4.2 | cURL error 6: Couldn't resolve host 'premium.wpmudev.org' (

WPMU DEV Dashboard and the server where ipcglobal.com.au is hosted are not talking to each other.
This is the error message:
[WPMUDEV API Error] 4.2 | cURL error 6: Couldn't resolve host 'premium.wpmudev.org' ((unknown URL) [500])

This the url: https://www.ipcglobal.com.au