Realizando la siguiente acción desde consola ssh
sudo /etc/init.d/networking restart
El resultado es
* Running /etc/init.d/networking restart is deprecated because it may not enable again some interfaces
* Reconfiguring network interfaces...
resolvconf: Error: /etc/resolv.conf isn't a symlink, not doing anything.
resolvconf: Error: /etc/resolv.conf isn't a symlink, not doing anything.
resolvconf: Error: /etc/resolv.conf isn't a symlink, not doing anything.
ssh stop/waiting
ssh start/running, process 26344
resolvconf: Error: /etc/resolv.conf isn't a symlink, not doing anything.
ssh stop/waiting
ssh start/running, process 26394
Y deja de resolver dns
Al ejecutar
sudo service zentyal network restart
Vuelve a comportarse todo de manera normal
Gracias