Cannot send messages
Last Friday our servers within a DAG of a pair of Exchange Server 2010 stopped sending messages. Both are running with Windows Server 2008 R2. They have all Exchange functions working.All of them are blocked in the queue with this error: 451 4.4.0 Primary target IP address responded with "421 4.2.1 Unable to connect". Attempted failover to alternate host, but that did no succeed. Either there no alternate hosts, or delivery failed to all alternate hosts. The NDR message includes this text Información de diagnóstico para los administradores: Generando servidor: correo1.central.vmv hanmisd@gmail.com #550 4.4.7 QUEUE.Expired; message expired ## Encabezados de mensajes originales: Received: from CORREO2.central.vmv ([fe80::39cb:806:6045:a4a6]) by correo1.central.vmv ([fe80::a584:fae6:6ce0:bd32%14]) with mapi; Fri, 6 Aug 2010 11:58:52 +0200 From: Alberto <Alberto@vmv.com.es> To: "hanmisd@gmail.com" <hanmisd@gmail.com> Subject: prueba Thread-Topic: prueba Thread-Index: Acs1Tflqi4arkIsrROSmOiKeSZXpYA== Date: Fri, 6 Aug 2010 09:58:52 +0000 Message-ID: <A3E0C8F34F22AB488A0025B6ECBC1C7F1DE9130B@correo2.central.vmv> I've checked DNS, firewalls, antivirus and everything is OK, I can telnet all smtp servers within network passing port 25. My IP is not blacklisted, and I have no idea where can be the error. Thank you!
August 10th, 2010 3:54pm

Hi, it seen like DNS issue or could not reach GC, try changing the DNS entry on these servers it might help.Ripu Daman Mina | MCSE 2003 & MCSA Messaging
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August 10th, 2010 6:07pm

No luck, I've tried 3 pairs of DNS servers and it keeps the same.
August 11th, 2010 12:43pm

OK, problem solved. Telefonica Nemesys blocked 25 port for "some" servers, not for mailhost.terra.es and didn't notify this to anyone. Telecommunications in Spain still remain at High Medium Age.
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August 11th, 2010 2:27pm

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