DNS zone create with live ip reqired reverse lookupzone ?

Question

Hello,

I have windows server 2003 domain and forest level, i got event id 4521 generated with The DNS server encountered error 32 attempting to load zone xyz.com from Active Directory. The DNS server will attempt to load this zone again on the next timeout cycle. This can be caused by high Active Directory load and may be a transient condition.

I have Created primary zone with live ip, so its require to create reverse zone for that live ip? because that website not hosted in our network.?

Answer 1

Hi,

Thanks for posting in Q&A platform.

Regarding of the Event 4521, may I know when did this event occurred?

Normally Event 4521 happens when DC is reboot, it tries to load the zone from AD & registry and since the zone still exists in registry might be the issue. Delete the duplicate zone from the registry which doesn't exists in DNS console.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\DNS Server\Zones

Or you can use ADSI Edit to check if there is any duplicate zone, if yes, please delete them. Regarding of how to use ADSI Edit, please refer to the following article.

Using ADSI Edit to Resolve Conflicting or Duplicate AD Integrated DNS zones
Please Note: Since the websites are not hosted by Microsoft, the links may change without notice. Microsoft does not guarantee the accuracy of this information.

For reverse lookup zone, its not mandatory, but its always good to create reverse lookup zones for IP to hostname resolution. AD is not dependent on reverse lookupzone, but there might be certain applications which require this feature.

Here is a similar thread discussed before, please kindly check if it is helpful.
https://social.technet.microsoft.com/Forums/en-US/d78f0074-7e99-4389-ba46-6f817014a64a/dns-event-id-4521?forum=winservergen

Please refer to the following article for more information related to Event 4521
https://social.technet.microsoft.com/wiki/contents/articles/1461.event-id-4521-dns-server-active-directory-integration.aspx

Hope my answer will help you.

Best Regards,
Sunny

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