The Netlogon service on a Windows 2000 domain controller will log one or more of these System events if it does NOT receive a 'success' message from the DNS server that owns the zone of the record that is being registered/deregistered.
The event log may contain:
<b>Netlogon 5775</b> - Deregistration of the <b>DNS</b> record <record_name_and_dns_info> failed.
<b>Netlogon 5781</b> - Dynamic registration or deregistration of one or more <b>DNS</b> records failed.
Possible reasons for NOT receiving a 'success' message are:
domain controller are not properly configured.
<b>Connectivity:</b> This domain controller does not have IP, or TCP/UDP
connectivity to the <b>DNS</b> servers that own the zones
to which records need to be registered or deregistered.
<b>DNS server configuration:</b> The <b>DNS</b> server cannot accept dynamic updates or is
not configured to accept dynamic updates. If the <b>DNS</b>
server that is used by the <b>DC</b> is not authoritative
for the zones to which the <b>Netlogon</b> service is
attempting to register or deregister, the <b>DNS</b> server
must be able to provide this <b>DC</b> the IP address of the
<b>DNS</b> servers that are authoritative for the affected zones.