Jan 30, 2011 – I've got 2 Exchange 2010 servers. 1. Edge Transport, which .

12 posts - 12 authors451 4.4.0 Primary Target IP address responded 421 4.2.1 unable to connect.

10 posts - 3 authors - Last post: Apr 30, 2010451 4.4.0 Primary Target error Exchange 2007 / 2010.

6 posts - 3 authors - Last post: Dec 16, 2010451 4.4.0 Primary target IP address responded with: "421 4.2.1 Unable to connect." Attempted failover to alternate host, but that did not succeed .

Jun 14, 2007 – Hello Experts: I am running Exchange 2007: I have a problem with sending email to a customer with the messages getting stuck in the que: The .

"451 4.4.0 Primary target IP address responded with: "421 4.4.2 Connection dropped due to SocketError." Attempted failover to alternate host, but that did not .

451 4.4.0 DNS query Failed For me, it was just checking the box next to Use the External DNS Lookup settings on the transport server. in the Network tab of the .

Hi I am using Exchange 2007 and have just installed a new edge server and when I try to send external e-mails they get stuck in the queue .

Jun 19, 2009 – Exchange 2007 Difficulties delivering email to some domains – Error 451 4.4.0 DNS query failed. Tags: Exchange. Here is an interesting one .

2 posts - 2 authorsQueue Viewer shows 451 4.4.0 DNS query failed, but nslookup -q=mx thedomain .

Apr 11, 2008 – Posts Tagged '451 4.4.0 Primary target IP address responded' . LastError : 451 4.4.0 Primary target IP address responded with: “451 5.7.3 .

Sep 7, 2009 – Hi, I am running Windows SBS 2008 Server. I am trying to set our outbound email to use a smarthost "smtp.surfdsl.net" whenever I set up t.

Mar 18, 2010 – Fixes a problem in which message delivery fails from an Edge Transport server to a Hub Transport server when the hosts file for name .

Nov 19, 2008 – 451 4.4.0 DNS query failed ? error on Exchange 2007 Edge Server . I found this error in Queue Viewer on Edge Server: 451 4.4.0 DNS query .

I told you 451 4.4.0 you should have gotten a bodyguard, he lectured. Carrying that kind of cash around is just askin' for trouble. .

Jul 7, 2009 – The error message on the queue states 451 4.4.0 DNS query failed. Well, it looked liked from here that there might be some issue with the DNS, .

451 4.4.0 avastd address error: %s (%d) #149; 451 4.4.0 avastd open error: %s . 451 4.4.0 unexpected clamd result: %s #206: The clamd daemon returned an .

5 posts - 4 authors - Last post: Jun 29451 4.4.0 Primary target IP address responded with: "421 4.4.2 Connection dropped due to ConnectionReset." So i'm not sure how to continue. .

6 posts - 3 authors - Last post: Jul 29, 2008451 4.4.0 Primary target IP address responded with: "421 4.2.1 Unable to connect." Attempted failover to alternate host, but that did not succeed .

Jun 19, 2009 – Exchange 2007 Difficulties delivering email to some domains – Error 451 4.4.0 DNS query failed. Here is an interesting one but quite .

Exchange 2010 Error 451 4.4.0 Error DNS Query Failed · Jun 26. Posted by wfcastle33. We've seen this happen at two environments recently. Both with Small .

Feb 10, 2011 – Hey all! This blog's focus from day one is, and always has .

10 posts - 1 author - Last post: Oct 6, 2010For the other 5% I get 451 4.4.0 Errors, saying either "Primary target IP address responded with 421 4.2.1 Unable to connect," or "DNS query .

10 posts - 3 authors - Last post: Sep 8, 2009Hi, I am running Windows SBS 2008 Server. I am trying to set our outbound email to use a smarthost "smtp.surfdsl.net" whenever I set up the .

8 posts - Last post: Dec 6, 2007451 4.4.0 primary target IP address responded with "421.4.4.2 unable to .

Aug 17, 2010 – 451 4.4.0 Primary target IP address responded with: “454 4 .

2 posts - 2 authors - Last post: Sep 17, 2007HMC 4.0: 451 4.4.0, windows_hosting.microsoft_solution_for_hosted_exchange, Date : 9/13/2007 8:36:42 PM, Replies: 1, Views: 98, .

7 posts - 4 authors - Last post: Jun 27, 2007LastError : 451 4.4.0 Primary target IP address responded with: "451 5.7 .3 Cannot achieve Exchange Server authentication." Attempted .

Jul 30, 2010 – “451 4.4.0 Primary target IP address responded with: “451 5.7.3 Cannot achieve Exchange Server authentication.” Attempted failover to .

Sep 24, 2009 – I brought up the queue viewer and noted the namespace i was trying to send to and it had a retry status with an error of "451 4.4.0 DNS Query .

May 18, 2010 – Exchange Error 451 4.4.0 primary target IP address responded with. Problem. You see this error message on your Exchange outbound .

1 post - Last post: Jan 25, 2009451 4.4.0 Primary Target IP address responded 421 4.2.1 unable to connect .

May 10, 2010 – Exchange 2010 451 4.4.0 Primary target IP address responded with: "451 5.7.3 Cannot achieve Exchange Server authentication." Here is one .

Dec 23, 2010 – Problem: Emails to a particular domain were not going through. Emails to all other domains were being received fine.dcswa-ex01 = Edge .

They are also queuing with the following error as well (interchangeably it seems): 451 4.4.0 Primary target IP address responded with: "421 4.2.1 Unable to .

2 posts - 2 authorsDnsConnectorDelivery Error 451 4.4.0 DNS Query Failed.

4 posts - 3 authors - Last post: Feb 26, 2009All of a sudden today the queue viewer is reporting 451 4.4.0 DNS query failed on a number of domains. Mail is flowing properly to just about .

Jan 7, 2010 – Mail in both queues reported errors of "451 4.4.0 Primary target IP address responded with: "421 4.4.2 Connection dropped." Attempted failover .

Jan 25, 2009 – I tried to send a massage from the edge to HUB by using . Exchange authentication and the certificate, . Remove the subscription form both .

Jun 26, 2011 – Exchange 2010 Error 451 4.4.0 Error DNS Query Failed. Jun 26. Posted by wfcastle33. We've seen this happen at two environments recently. .

2 posts - 2 authors - Last post: May 13, 2009Outlook Forum. Exchange Server. Current discussion: URGENT - 451 4.4.0 DNS .

9 answers - Feb 24Top answer: I've fixed the problem. It was two things: my ISP was blocking port 25 and my exchange server was using port 2525 on the send connector. Thanks for the help.

5 posts - 5 authors - Last post: Nov 27, 2007"451 4.4.0 Primary target Ip addre. - 27.Apr.2007 . Status: offline, 451 Primary target ip address responded with: 421 4.2.1 Unable to connect. .

May 21, 2009 – Integrity Computer Service provides dedicated support for all your computer technologies in the greater Statesville, Mooresville, and Mocksville .

Jul 7, 2009 – The error message on the queue states 451 4.4.0 DNS query failed. Well, it looked liked from here that there might be some issue with the DNS, .

Dec 22, 2010 – 451 4.4.0 DNS query failed. Problem: Emails to a particular domain were not going through. Emails to all other domains were being received .

Mar 18, 2011 – Observe this message. 451 4.4.0 Primary target IP address responded with: "451 5.7.3 Cannot achieve Exchange Server authentication." .

Mar 30, 2011 – 451 4.4.0 Primary target IP address responded with: "451 5.7.3 Cannot achieve Exchange Server authentication." TechNet Blogs > Tom Kern .

3 posts - 2 authors - Last post: Jan 9, 2009Outlook Forum. Exchange Server. Current discussion: Edge Server 2007 - 451 4.4.0 Error.

Jul 27, 2011 – "451 4.4.0 Primary target IP address responded with: "421 4.4.2 Connection dropped."My environment is:Exchange 2007 without SP1,Windows .

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