Apareceu isso:
16-Feb-2016
16:11:07.133 general: warning: checkhints: h.root-servers.net/A
(198.97.190.53) missing from hints
16-Feb-2016
16:11:07.133 general: warning: checkhints: h.root-servers.net/A
(128.63.2.53) extra record in hints
16-Feb-2016
16:11:07.133 general: warning: checkhints: h.root-servers.net/AAAA
(2001:500:1::53) missing from hints
16-Feb-2016
16:11:07.133 general: warning: checkhints: h.root-servers.net/AAAA
(2001:500:1::803f:235) extra record in hints
Solução:
Atualizar o arquivo
/etc/bind/db.root com o conteúdo do arquivo do link
http://www.internic.net/domain/named.root
e reiniciar o bind.
