Can´t login to facebook to set a new connection after resetting

I get the “Something went wrong during the connection with Facebook API. Please, try to refresh the page.” error, so I followed the instructions to reset the connection removing the business integration, but when I try to make a new facebook login to create a new one, I get the following error:

This site can’t be reachedCheck if there is a typo in wca-connector.adespresso.com.
DNS_PROBE_FINISHED_NXDOMAIN

The page I need help with: [log in to see the link]