DOCUMENT:Q185934  12-APR-1999  [exchange]
TITLE   :XCON: Exchange Server MTA Always Uses RTSE Window Size 3
PRODUCT :Microsoft Exchange
PROD/VER:WinNT:5.0,5.5
OPER/SYS:
KEYWORDS:exc55sp2fix

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The information in this article applies to:

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

When you connect Microsoft Exchange Server to other X.400 systems or to other
Exchanger Servers computers via an X.400 connector, Exchange Server does not use
a reliable transfer service element (RTSE) window size greater than 3. Exchange
Server requests the window size is 3, even if the configuration in the MTA
Override Property Page says 5 for example. If the connection is opened by
another MTA, Exchange Server will negotiate the RTSE window size down to 3.

RESOLUTION
==========

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

A supported fix is now available, but has not been fully regression-tested and
should be applied only to systems experiencing this specific problem. Unless you
are severely impacted by this specific problem, Microsoft recommends that you
wait for the next Service Pack that contains this fix. Contact Microsoft
Technical Support for more information.

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

To resolve this problem, obtain the latest service pack for Exchange Server
version 5.5. For more information, please see the following article in the
Microsoft Knowledge Base:

   Q191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack


STATUS
======

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

Microsoft has confirmed this to be a problem in Exchange Server versions 5.0.

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

Microsoft has confirmed this to be a problem in Exchange Server versions 5.5.This
problem was first corrected in Exchange Server 5.5 Service Pack 2.


MORE INFORMATION
================

The new Exchange MTA will now use the RTSE window size as specified in the
Exchange Server Administrator program.


Additional query words:
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Keywords          : exc55sp2fix 
Technology        : kbExchangeSearch kbExchange500 kbExchange550 kbZNotKeyword2
Version           : WinNT:5.0,5.5
Issue type        : kbbug
Solution Type     : kbfix

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