I have debian 9 CT and when I try to update, or download something it fails. due to Temporary failure resolving 'security.debian.org' ... people seems to think that is DNS error. I had my domain as search domain from installation of PVE. So I kept searching and found article but I do not really understand it. So I ask you, the community. What should I put into my search domain ? Thanks. BTW. Here is how I got it now.