DOCUMENT:Q124737  20-MAY-2002  [pcmail]
TITLE   :X400: Unable to Send or Receive Mail
PRODUCT :Microsoft Mail For PC Networks
PROD/VER:MS-DOS:3.0,3.2
OPER/SYS:
KEYWORDS:

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

 - Microsoft Mail Gateway to X.400, versions 3.0, 3.2 
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SYMPTOMS
========

Version 3.2 of Microsoft Mail Gateway to X.400 may disconnect an existing
session under heavy use conditions or it may be unable to establish outgoing or
incoming connections, and it may display one or all of the following errors:

   ERROR 3 (RTS): RTS open refused (Session limit exceeded)

   DEBUG (T4_recv): Connection xx: tp_wait() failed:15

   DEBUG (T4_send): Connection xx: tp_accept() failed:1

CAUSE
=====

If the gateway is under heavy use, two errors may occur as it counts the number
of active connections:

1. This count is incorrectly decremented with every occurrence of a connection
   request on the listening connection. This is incorrect; the listening
   connection is not an active connection. Eventually, the count will decrement
   to zero (0), and if a connection is active, it will be closed.

2. Every attempted connection used additional memory in RAM. The previous
   connection attempt was not being cleared from memory. The lack of memory
   results in the "tp-wait" errors. The "tp_accept" errors tell the sending MTA
   that the gateway cannot accept incoming connections at that time.

For additional information, please see the following article in the Microsoft
Knowledge Base:

   Q119303 X400: Err Msg: ERROR 3 (RTS): RTS Open Refused...

RESOLUTION
==========

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.

To resolve this problem, 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:

   File Name      Version
   ----------------------
   X400gate.exe   3.2.12

This hotfix has been posted to the following Internet location as X400gy2k.exe:

   ftp://ftp.microsoft.com/bussys/mail/gateways-public/All-Y2K/


STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Mail Gateway to X.400
versions 3.0 and 3.2.

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

The updated X400GATE.EXE file includes the following modifications for the
causes listed above:

1. The count is no longer decremented unless an active connection is released.

2. The TP4 stack is deactivated and reactivated with each connection attempt,
   freeing up memory.

There is also a workaround for the memory issue: the TP4 stack can be allocated
more memory by adjusting the [PLUTO] section of the PROTOCOL.INI file, as
follows:

   [PLUTO]

   memory=8192

The default value is 512 bytes/connection. For more information about the memory
parameter, see Chapter 2 of the TP4/CLNP "Administrator's Reference."

Additional query words:

======================================================================
Keywords          :  
Technology        : kbMailSearch kbMailGateSearch kbZNotKeyword3 kbMailGatex400300 kbMailGatex400320
Version           : MS-DOS:3.0,3.2
Issue type        : kbbug
Solution Type     : kbfix

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

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