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Q251318: XCON: MTA Uses Node IP Address Instead of Cluster IP Address

Article: Q251318
Product(s): Microsoft Exchange
Version(s): winnt:5.5 SP3
Operating System(s): 
Keyword(s): exc55sp3 kbExchange550preSP4fix kbExchange550sp4Fix
Last Modified: 12-NOV-2000

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The information in this article applies to:

- Microsoft Exchange Server, version 5.5 SP3 
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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, please see the following article in the Microsoft
Knowledge Base:

  Q191014 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:

  Q197378 XCON: MTA Generates 9301 Events on Incoming Connections

- Open the IP addresses of the nodes in the firewall.

STATUS
======

Microsoft has confirmed this to be 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.


Additional query words:

======================================================================
Keywords          : exc55sp3 kbExchange550preSP4fix kbExchange550sp4Fix 
Technology        : kbExchangeSearch kbZNotKeyword2 kbExchange550SP3
Version           : winnt:5.5 SP3
Issue type        : kbbug
Solution Type     : kbfix

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