Solved

Internal / external DNS

Posted on 2014-02-11
6
247 Views
Last Modified: 2014-02-17
I have a domain mydomain.com  I also have an external POP3 mail server mail.mydomain.com.  when I try to resolve mail.mydomain.com internally it resolves to and old external IP address.  (we just switched mail carriers) Externally mail.mydomain.com resolves correctly to the new external IP.  I looked in DNS and there is not any records pointing to the old IP.  I looked at the HOSTS file on the server and there is no entry's.

Any place I can look to find out where this pointer to the old IP address is?  Also I was going to just put in a new A Record to point mail.mydomain.com to the new IP address but I would receive this error message.

host record mail.mydomain.com can not be created node is a cname dns record.

Any Ideas?
0
Comment
Question by:Corporal_K
  • 3
  • 2
6 Comments
 
LVL 8

Expert Comment

by:Mandeep Khalsa
ID: 39851714
Try "ipconfig /flushdns" from the command prompt to clear the cached DNS entries on your DNS server.
0
 
LVL 78

Expert Comment

by:David Johnson, CD, MVP
ID: 39851979
It may be set at the registrar of your domain
0
 

Author Comment

by:Corporal_K
ID: 39853528
ipconfig /flushdns is the first thing I tried.  I even rebooted the server.  For a work around I added the entry's for mail.mydomain.com and www.mydomain.com to the hosts file and then it resolves to the correct IP.  Problem is I do not want to edit the hosts file on all the computers.  Also if I remove the hosts entry's it reverts back to the old IP address.

@David  This works externally fine so can't be the registrar or I don't see how it could be???
0
IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

 
LVL 8

Expert Comment

by:Mandeep Khalsa
ID: 39853712
Have you checked your DNS's PTR records as well? Maybe a reversing entry there is what is causing this? And you only have 1 DNS server correct?
0
 

Accepted Solution

by:
Corporal_K earned 0 total points
ID: 39853997
Problem is resolved.  The issue was there were A records pointing to the old IP address.  The entry's did not show because there was a filter on the list.  I have never used the filter so I did not even know it was there.
0
 

Author Closing Comment

by:Corporal_K
ID: 39864316
There were DNS entry's
0

Featured Post

Get up to 2TB FREE CLOUD per backup license!

An exclusive Black Friday offer just for Expert Exchange audience! Buy any of our top-rated backup solutions & get up to 2TB free cloud per system! Perform local & cloud backup in the same step, and restore instantly—anytime, anywhere. Grab this deal now before it disappears!

Join & Write a Comment

Nearly six years ago I was hired by a company to be their senior server engineer. One of my first projects was to implement Exchange Server 2007 on a Windows Server 2008 Single Copy Cluster for high availability. That was the easy part; read on to l…
Ever notice how you can't use a new drive in Windows without having Windows assigning a Disk Signature?  Ever have a signature collision problem (especially with Virtual Machines?)  This article is intended to help you understand what's going on and…
In this video, we discuss why the need for additional vertical screen space has become more important in recent years, namely, due to the transition in the marketplace of 4x3 computer screens to 16x9 and 16x10 screens (so-called widescreen format). …
In this Micro Video tutorial you will learn the basics about Database Availability Groups and How to configure one using a live Exchange Server Environment. The video tutorial explains the basics of the Exchange server Database Availability grou…

746 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

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now