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421 4.4.2 connection dropped due to SocketError

Posted on 2011-10-18
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Last Modified: 2013-03-25
I have problmes to send mails, exchange sent me tihs error: 451 4.4.0 primary target iIPaddress respondend with "421 4.4.2 conection dropped due to socketerror
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Question by:ATIOSA
13 Comments
 
LVL 12

Expert Comment

by:Deepu Chowdary
ID: 36988999
How many exchange servers do you have,..?
mails are suck in which queue..?
Also check the ip blacklist once.

Also check this once
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Author Comment

by:ATIOSA
ID: 36989045
Thanks to both, Actually I have only one server, I don't understand about the queue.. I checked black list and everythingis ok.
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Creating Active Directory Users from a Text File

If your organization has a need to mass-create AD user accounts, watch this video to see how its done without the need for scripting or other unnecessary complexities.

 

Author Comment

by:ATIOSA
ID: 36990093
Hi, i tested creating the DWORD value in the registry but the problem not solve. any idea?
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LVL 6

Expert Comment

by:sumit_arora
ID: 36992055
Under Server Configuration right click on the server and select properties, under External DNS lookups, add your ISP DNS servers in here.

Then under Organisation Configuration > Hub Transport, check the properties of your internet send connector under Network check the box to use External DNS lookup settings.

Restart the Microsoft Exchange Transport service
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LVL 6

Expert Comment

by:sumit_arora
ID: 36992081
Issue can also be caused by your firewall
===============================================
Have you kept any firewall between both site WAN connectivity, Are you able to telent other site Exchange Server at port 25 and can send test mail thru SMTP command ?? . Also try to restart HUB transport servive on remote HUB server and check the status.

Please send test mail thru SMTP comand and share result.

Use Telnet to Test SMTP Communication:
http://exchange.mvps.org/smtp_frames.htm
http://technet.microsoft.com/en-us/library/bb123686.aspx
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Expert Comment

by:sumit_arora
ID: 36993551
Also please check you Ip is not listed on the Black list too

http://www.mxtoolbox.com/blacklists.aspx
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Author Comment

by:ATIOSA
ID: 36994459
Hi Sumit, I test the first steps you mention but nothing change. Here is the result for mail thru SMTP command

220 mail.atio.com.mx ESMTP (302e03eed096096c5f4feb752280b0b1)
helo hotmail.com
250 mail.atio.com.mx Hello hotmail.com [8.14.244.13], pleased to meet you
mail from:xx@hotmail.com
250 Ok
rcpt to: xx@atio.com.mx
554 Service unavailable; Client host [hotmail.com] blocked using Barracuda Reputation; http://www.barracudanetworks.com/reputation/?r=1&ip=8.14.244.13

I'm not in blacklist.
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LVL 6

Expert Comment

by:sumit_arora
ID: 36994873
check setting on barracuda, i think its causing this issue  
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Accepted Solution

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ATIOSA earned 0 total points
ID: 36994914
I talked with my ISP and apparently is a problem with a PTR register in DNS SERVER... I hope to found a solution.
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Expert Comment

by:sumit_arora
ID: 37151422
any update on this issue
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Expert Comment

by:mkbster
ID: 39005282
Similar problem.

Exchange 2010 on Win SBS 2011 server.

I have 2 outside email domains getting this error.  All other email flows thru.

SMTP via telnet works.

Interesting that both smtpsend log shows at the end, before retrying the connection
2013-03-14T00:03:01.558Z,Default to Internet,08CFD871781A7418,0,,198.147.194.42:25,*,,attempting to connect
2013-03-14T00:03:01.558Z,Default to Internet,08CFD871781A7418,1,192.168.1.250:19949,198.147.194.42:25,+,,

IP address, in the last line, is different then the original  EHLO session ip addresss- clue?
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Author Closing Comment

by:ATIOSA
ID: 39017202
At the end, there was a problem with DNS resolutions.
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Creating Active Directory Users from a Text File

If your organization has a need to mass-create AD user accounts, watch this video to see how its done without the need for scripting or other unnecessary complexities.

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