Novell NETWARE 6-DOCUMENTATION Manual page 1700

Cause 1—When you created a new zone, the PTR records were not
created or the PTR records have been deleted or changed.
Solution 1—When you configure a zone, always select Yes when
prompted to create a companion zone. If you created a companion zone,
verify that the IP address and hostname are correct. Checkers can easily
catch neglected PTRs. For further information, refer to RFCs 1537 and
1713.
Cause 2—The host is down or is unreachable.
Solution 2—Use PING to locate the connectivity problem. If the problem
exists in your domain, make the necessary repairs to restore connectivity.
Cause 3—The name server for that domain is not configured with
information for the host.
Solution 3—Configure the name server for that domain with information
for the host.
Problem—You cannot access a host in a different domain using its
domain name, but you can access it using its IP address.
Cause—The IP address or CNAME alias entry of the host's primary or
secondary name server was changed, but the parent domain was not
informed of the change. The address information in the glue record
maintained by the parent domain has become invalid. Another possible
cause is that the original address information in the glue record for the
local zone is invalid or missing.
Solution—When you configure a new zone, always enter the IP address
when prompted. Verify that all parent zones have the same address
information.
Problem—Nonlocal hosts cannot find the primary domain server for a
subdomain and, therefore, cannot access hosts in that subdomain.
Cause—The IP address of a subdomain's primary server does not match
the hostname and IP address configured in the parent domain for the
subdomain's primary server.
Solution—Verify that the hostname and IP address for the subdomain's
primary server configured in the parent domain is valid and matches the
information configured in the subdomain.
Problem—A particular host cannot access other hosts.
Cause—The resolv.cfg file (or equivalent) of the host does not contain the
correct domain name or name server address.
126 Novell DNS/DHCP Management Utility Administration Guide