On Sun, Jul 17, 2011 at 10:34:56AM +0300, Arun N S <ns.arunns at gmail.com> wrote a message of 55 lines which said: > I was wondering why NSD returns SERVFAIL for recursive queries, > normally it is REFUSED ? AFAIK, no RFC explicitely says what a name server should return when it does not accept out-of-zone queries.