@amigo,

If you want to confirm that your problem is merely a user error (misuse of /etc/hosts) combined with a bug in QNetMan2 (there's no reason why it should attempt to get a DNS name for 0.0.0.0), you could just delete all 0.0.0.0-related entries in /etc/hosts and see how QNetMan2 works OK without showing any doubleclick.net address.