This section deals with some of the problems that might arise while trying to configure Bind with Active Directory.
Problem: Some RRset that ought to exist, does not exist.
This message means what it says. The dynamic update request failed because a
prerequisite condition - that some name or group of names (RRset) existed -
did not hold. An NXRRSET error - no such RRset - was returned to
the client making the request.
Problem: Some RRset that ought not to exist, does exist.
Somebody tried to add a RR(set) using dynamic update which was already present
in the zone. With regards to prerequisite, the condition "rrset does
not exist" turns out to be false, i.e. the RRset does exist. Since
the condition is false, the prerequisite is not fulfilled.