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Exchange SMTP problem

Posted on 2014-12-20
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Last Modified: 2014-12-20
we are using an email proxy and when we get email from out of the company we get the following error and there is no error with local sendings

what should be the problem symptoms like given below


2014-12-20T13:30:44.623Z,POSTA\Default Frontend POSTA,08D1EA65A018C370,52,185.9.157.14:25,185.9.157.13:52871,<,DATA,
2014-12-20T13:30:44.623Z,POSTA\Default Frontend POSTA,08D1EA65A018C370,53,185.9.157.14:25,185.9.157.13:52871,*,SMTPSubmit SMTPAcceptAnySender SMTPAcceptAuthoritativeDomainSender AcceptRoutingHeaders,Set Session Permissions
2014-12-20T13:30:44.623Z,POSTA\Default Frontend POSTA,08D1EA65A018C370,54,185.9.157.14:25,185.9.157.13:52871,>,250 2.1.0 Sender OK,
2014-12-20T13:30:44.623Z,POSTA\Default Frontend POSTA,08D1EA65A018C370,55,185.9.157.14:25,185.9.157.13:52871,>,250 2.1.5 Recipient OK,
2014-12-20T13:30:44.623Z,POSTA\Default Frontend POSTA,08D1EA65A018C370,56,185.9.157.14:25,185.9.157.13:52871,>,354 Start mail input; end with <CRLF>.<CRLF>,
2014-12-20T13:30:44.623Z,POSTA\Default Frontend POSTA,08D1EA65A018C370,57,185.9.157.14:25,185.9.157.13:52871,*,,Proxy destination(s) obtained from OnProxyInboundMessage event
2014-12-20T13:30:44.623Z,POSTA\Default Frontend POSTA,08D1EA65A018C370,58,185.9.157.14:25,185.9.157.13:52871,*,,NextHopFqdn property is null or whitespace when creating InboundProxyLayer
2014-12-20T13:30:54.888Z,POSTA\Default Frontend POSTA,08D1EA65A018C370,59,185.9.157.14:25,185.9.157.13:52871,*,,"Message or connection acked with status Retry and response 451 4.4.0 Primary target IP address responded with: ""454 4.7.0 Temporary authentication failure."" Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts. The last endpoint attempted was 2002:b909:9d0e::b909:9d0e:2525"
2014-12-20T13:30:54.888Z,POSTA\Default Frontend POSTA,08D1EA65A018C370,60,185.9.157.14:25,185.9.157.13:52871,>,451 4.7.0 Temporary server error. Please try again later. PRX4 ,
2014-12-20T13:30:54.888Z,POSTA\Default Frontend POSTA,08D1EA65A018C370,61,185.9.157.14:25,185.9.157.13:52871,<,QUIT,

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PS C:\Users\administrator.SPD> repadmin /showreps
LDAP error 81 (Server Down) Win32 Err 58.
PS C:\Users\administrator.SPD> repadmin /showreps
LDAP error 81 (Server Down) Win32 Err 58.
PS C:\Users\administrator.SPD> DCDIAG /V

Directory Server Diagnosis

Performing initial setup:
   Trying to find home server...
   * Verifying that the local machine posta, is a Directory Server.
   ***Error: posta is not a Directory Server.  Must specify /s:<Directory Server> or  /n:<Naming Context> or nothing to
   use the local machine.
   ERROR: Could not find home server.

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Question by:Cahit Eyigunlu
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Accepted Solution

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Gareth Gudger earned 500 total points
ID: 40510801
Hey Cahit,

DCDIAG will fail on an Exchange Server. DCDIAG is a troubleshooting tool for Domain Controllers. You would need to either run that command from a DC or specify the /S switch.

Based on this part of your log, it looks like you need to provide credentials for your email proxy. Or your credentials are wrong.

454 4.7.0 Temporary authentication failure

This forum thread indicates it could also be caused by a time sync issue. One user said all they did was restart the Transport and AD Topology Services.
https://social.technet.microsoft.com/Forums/en-US/888fb9f6-a991-4ab1-988c-c61cf4988e80/451-440-primary-target-ip-address-responded-with454-470-temporary-authentication-failure?forum=exchangesvrsecuremessaginglegacy
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Author Closing Comment

by:Cahit Eyigunlu
ID: 40510824
time issue thanks
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LVL 31

Expert Comment

by:Gareth Gudger
ID: 40510971
Awesome!
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