Microsoft KB Archive/251318

= XCON: Message Transfer Agent Uses Node IP Address Instead of Cluster IP Address =

Article ID: 251318

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Service Pack 3

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This article was previously published under Q251318





SYMPTOMS
When you have two Exchange Server computers in two sites that are connected with a site connector through a firewall as follows:

Exchange Server in Site 1 <--> [firewall] <--> Exchange Server (on a Cluster Server) in Site 2

If the firewall between the sites opens only to the Cluster Server IP address, no mail can be sent or received.



CAUSE
This issue can occur if the message transfer agent (MTA) uses the active node IP address instead of the Exchange Server Cluster Server group IP address to initiate a connection.



RESOLUTION
To resolve this problem, obtain the latest service pack for Exchange Server 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

191014 XGEN: How to Obtain the latest Exchange Server 5.5 Service Pack



WORKAROUND
To work around this issue:  Move to an X.400 Connector and fix the address.For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

197378 XCON: MTA Generates 9301 Events on Incoming Connections

 Open the IP addresses of the nodes in the firewall.



STATUS
Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5 Service Pack 3. This problem was first corrected in Exchange Server 5.5 Service Pack 4.

Keywords: kbbug kbexchange550presp4fix kbexchange550sp4fix kbfix kbqfe KB251318

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