DOCUMENT:Q152932  20-MAY-2002  [exchange]
TITLE   :XCON: X.400 Connector Uses Session Selector on X.400 Connections
PRODUCT :Microsoft Exchange
PROD/VER:winnt:4.0,5.0,5.5
OPER/SYS:
KEYWORDS:

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-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Exchange Server, versions 4.0, 5.0, 5.5 
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SYMPTOMS
========

If a Session Selector (S Sel) is defined for an X.400 connection defined with
X.410 conformance, communication to foreign X.400 systems may not work
properly.

The Windows NT application event log may contain the following entry:

   Event ID: 51
   Source: MSExchangeMTA

   Description:
   An unknown MTA has attempted to bind. The MTA name in bind is <REMOTE MTA
   NAME>. The MTA presentation address is
   /t:0x44454D4F/n:0x444545392D5443504950, Association index: 2018. [MTA XFER-IN
   35 42] (14)

CAUSE
=====

Exchange Server incorrectly allows a configuration that sends and expects to
receive a Session Selector (S Sel) on an X.410 conformant connection if defined
to do so in the X.400 Connector Stack property pages.

The following is taken from the Red Book, X.410, Page 110, Note 2:

   Message handling will not use Session Layer addressing, that is, a session
   address will not be passed in the Connect SPDU of the Session Layer.

An X.410 conformant connection is configured by choosing 1984 or 1988 X.410 mode
in the message transfer agent (MTA) conformance pane of the Advanced property
page for the X.400 Connector.

Exchange should ignore the S Selector value for X.410 conformant connections.


RESOLUTION
==========

Exchange Server 5.0
-------------------

A supported fix that corrects this problem is now available from Microsoft, but
has not been fully regression-tested and should be applied only to systems
experiencing this specific problem. If you are not severely affected by this
specific problem, Microsoft recommends that you wait for the next Microsoft
Exchange Server version 5.0 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services
to obtain the fix. For a complete list of Microsoft Product Support Services
phone numbers and information on support costs, please go to the following
address on the World Wide Web:

   http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

The English version of this fix should have the following file attributes or
later:

   Component: Message Transfer Agent (MTA)

   File Name     Version
   -------------------------
   Emsmta.exe    5.0.1461.37
   Ems_rid.dll   5.0.1461.37


Exchange Server 5.5
-------------------

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version
5.5. This problem has been corrected in the latest U.S. service pack for
Microsoft Exchange Server version 5.5. For information on obtaining the service
pack, query on the following word in the Microsoft Knowledge Base (without the
spaces):

   S E R V P A C K

WORKAROUND
==========

To work around this problem, do not define X.400 systems with S Selector values
if X.410 conformant connections will be used. By manipulating the OSI Protocol
Information in the Stack Property Page of the X.400 Connector, you may be able
to configure the X.400 Connector to send an S Selector (if necessary), but not
to expect one in return.

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Exchange Server
versions 4.0, 5.0, and 5.5.

Additional query words: kbbug4.00 kbbug5.00 XFOR kbbug5.50 kbfix5.50.sp1 kbfix5.0.sp3

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Keywords          :  
Technology        : kbExchangeSearch kbExchange500 kbExchange550 kbExchange400 kbZNotKeyword2
Version           : winnt:4.0,5.0,5.5
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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Copyright Microsoft Corporation 2002.