How we fix the wordPress cURL Error 6: could not resolve host?

cURL Error 6

1.  First, we log in via SSH and edit /etc/resolv.conf.

vi /etc/resolv.conf

2. Next, we add Google public name servers and comment on the other nameservers.

nameserver 8.8.8.8
nameserver 8.8.4.4
#nameserver 1xx.1xx.1xx.x
#nameserver 1xx.1xx.1xx.x

3. Then after making the changes, we restart Apache or Nginx.

service apache2 restart

This fixes the error.