DNS Issue

Posted on 2013-09-09
Medium Priority
Last Modified: 2013-09-16

We have multiple DNS servers in a 2003 AD level domain that we use for Windows 7 clients.  If we do a NSLookup from a client to the third DNS server in the list we are getting "unknown Non-existant domain".  This is a new error and is creating issues routing mail between a couple of domains that we have shared contacts with.

Here is some for info:

DNS Servers . . . . . . . . . . . :

Server:  UnKnown

*** UnKnown can't find Non-existent domain

DNS gives me headaches just thinking about it.  Any ideas on where to start?  Thanks.

Question by:tonyjoewalker
LVL 29

Accepted Solution

becraig earned 1000 total points
ID: 39477553
Do you have reverse lookup configured  ?

LVL 18

Expert Comment

by:Sarang Tinguria
ID: 39477613
correct ...it occurs when you do not have reverse lookup configured..even if you have check for the PTR record of the DC
LVL 10

Expert Comment

ID: 39478438
Howmany DCs are there in the domain? This occurs and known thing in single DC domain. If you have more than 1 DC then you have to create sub domain zone (_msdcs.domain.local) and restart DNS and Netlogon. However if DCDiag /test:DNS is in passed state then you can ignore it.

DNS Best Practices
The new generation of project management tools

With monday.com’s project management tool, you can see what everyone on your team is working in a single glance. Its intuitive dashboards are customizable, so you can create systems that work for you.

LVL 24

Assisted Solution

Sandeshdubey earned 1000 total points
ID: 39478699
Ensure correct dns setting on DC/clients as this:

Best practices for DNS client settings on DC and domain members.

-Also make sure the IPv6 is configured to dynamic (Automatically) if it is win2008 server.

- Create reverse lookup as other suggested.I will also recommend to check the health of DC too.run dcdiag /q and repadmin /replsum and post the log if error is reported with Ipconfif /all details.
LVL 16

Expert Comment

by:Bruno PACI
ID: 39482924

This error is not an error... This only means you have no reverse DNS zone in your DNS servers to resolve the IP to a DNS name...
That's it.

By the way, having reverse DNS zone is NOT mandatory. Active Directory does not need reverse DNS zone to be functional.

Other experts explained you how to create a reverse DNS zone to avoid the "error" message but personally I'm not sure that your issue is about this.
You may have any DNS issue and linked it to this "error" message (again, it is not an error in fact) but are you sure that creating reverse DNS zone will resolve your issue ???

Can you tell us more about your issue of mail routing (reverse DNS zone misconfiguration may cause issue about spam detecting but it can not cause issue about mail routing...).

Have a nice day

Author Comment

ID: 39495932
We do have reverse DNS configured.  All I did was move the IP that is registered in DNS to first in the list in the rDNS record and it seems to all work now.  Thank you for all the responses!


Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

It’s time for spooky stories and consuming way too much sugar, including the many treats we’ve whipped for you in the world of tech. Check it out!
There are a few different ways to preview your site before DNS resolves it to your (mt) Media Temple server.  The Plesk platform makes it easy.  See the following guide to learn how.
This tutorial will walk an individual through the steps necessary to join and promote the first Windows Server 2012 domain controller into an Active Directory environment running on Windows Server 2008. Determine the location of the FSMO roles by lo…
This tutorial will walk an individual through the process of transferring the five major, necessary Active Directory Roles, commonly referred to as the FSMO roles from a Windows Server 2008 domain controller to a Windows Server 2012 domain controlle…
Suggested Courses

600 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question