Solved

Exchange 2013 - DnsConnectorDelivery 451 4.4.0 DNS Query Failed

Posted on 2015-01-28
4
561 Views
Last Modified: 2015-02-06
Exchange server is running Windows 2012. Single Server.
DC/DNS server is running Windows 2012R2.  DNS uses our router for lookups.

I have to start saying, i started to experience these issues after upgrading from my old DC(2003) to 2012R2.

Most email has no issues sending, tho it seems domains that are hosted by google/gmail, have issues.  The email either send quickly as normal or will take a few rehours to send out. A few hours have gotten the "you email has been delayed", which i have set to 4 hours.  

I keeping getting this error: DnsConnectorDelivery 451 4.4.0 DNS Query Failed. The Error was: DNS Query failed with ErrorTimeout.

The current domain that is causing issues is eastonsd.org. i have no problems with nslookup on the exchange server, results below.

S:\>nslookup
Default Server:  bsddc.local
Address:  192.168.0.5

> set q=mx
> eastonsd.org
Server:  bsddc.local
Address:  192.168.0.5

Non-authoritative answer:
eastonsd.org    MX preference = 20, mail exchanger = ALT1.ASPMX.L.GOOGLE.COM
eastonsd.org    MX preference = 20, mail exchanger = ALT2.ASPMX.L.GOOGLE.COM
eastonsd.org    MX preference = 30, mail exchanger = ASPMX2.GOOGLEMAIL.COM
eastonsd.org    MX preference = 10, mail exchanger = ASPMX.L.GOOGLE.COM
eastonsd.org    MX preference = 30, mail exchanger = ASPMX4.GOOGLEMAIL.COM
eastonsd.org    MX preference = 30, mail exchanger = ASPMX5.GOOGLEMAIL.COM
eastonsd.org    MX preference = 30, mail exchanger = ASPMX3.GOOGLEMAIL.COM
>
S:\>nslookup eastonsd.org
Server:  bsddc.local
Address:  192.168.0.5

Non-authoritative answer:
Name:    eastonsd.org
Address:  66.246.215.161

whats my next step? after googling a bunch of different fixes, most seem to be for exchange 2007/2010. i'm currently not using any external dns lookups in exchange config.
dns.png
0
Comment
Question by:AfternoonShift
  • 2
4 Comments
 

Accepted Solution

by:
AfternoonShift earned 0 total points
ID: 40576570
OK.

i just made one change...  i checked "Use the external DNS look settings on servers with transport roles" and the emails sent.
i'll attach screenshot for location...

I'm not sure why all of a sudden i need to check this, but seems to work. Would still love to hear some feedback with anyone else that had this same issue.
send.png
0
 
LVL 6

Expert Comment

by:JeffG2583
ID: 40576669
Could it be the DNS cache on your router got corrupted? I've had to clear cache on Win 2008 servers to fix similar issues. Just a thought.
0
 
LVL 11

Expert Comment

by:Tej Pratap Shukla ~Dexter
ID: 40576679
hi..

Nice to listen from you that you have solved your query...

Whenever a user tries to send email an error with the message 451 “4.4.0 DNS Query Failed” pops up.

Generally this happens due to the misconfiguration or if we have booked the recipient domain.

Use the External DNS Lookup settings on the transport server

By default Exchange will use internal DNS servers - what is configured on the network card of the server.
This setting allows you to specify different external servers for Exchange to use instead of the local ones. They are used for transport only, so shouldn't affect the operation of the server for DNS.

However the setting is not used that often, and in most cases is not required.

Thanks
Dexter
0
 

Author Closing Comment

by:AfternoonShift
ID: 40593216
After clicking this option, email has been working without issues.
0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Learn to move / copy / export exchange contacts to iPhone without using any software. Also see the issues in configuration of exchange with iPhone to migrate contacts.
MS Outlook is a world-class email client application that is mainly used for e-communication globally.  In this article, we will discuss the basic idea about MS Outlook, its advanced features, and types of MS Outlook File formats.
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…
The basic steps you have just learned will be implemented in this video. The basic steps are shown to configure an Exchange DAG in a live working Exchange Server Environment and manage the same (Exchange Server 2010 Software is used in a Windows Ser…

803 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