Please omit the "boot up DNS error" part in my previous message. That was my fault. In one of the installations I have included some parameters in /etc/bind/named.conf.local file. Those errors were related to that.
Still, the server does not respond to queries outside.
Need help? Any suggestions would do fine.
Have you receive a BIND related issue in near future. I strongly believe that this related to the recent BIND update.