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Q254909: XCON: Connectors Stop with 9301 After Proxy Client Installed

Article: Q254909
Product(s): Microsoft Exchange
Version(s): winnt:4.0,5.0,5.5
Operating System(s): 
Keyword(s): kbFAQ exc4 exc5 exc55
Last Modified: 11-MAR-2000

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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 you install WinSock Proxy Client on an Exchange Server computer to send an
Internet Mail Connector (Exchange Server version 4.0) or Internet Mail Service
(Exchange Server version 5.0 and later) message out through a proxy server, and
an X.400 Connector is also installed on the Exchange Server computer, the
connector stops responding. The remote server generates events 9301 and 9202.

CAUSE
=====

This problem can occur because WinSock Proxy Client redirects the packets to a
proxy server. The proxy server then "proxies" the packet, which causes the proxy
server to send the packet to the remote X.400 server, because the source IP
address is the address of the proxy server. The remote message transfer agent
(MTA) rejects the connection request and generates event 9301, followed by event
9202.

RESOLUTION
==========

To resolve this problem, modify the Mspclnt.ini file on the Exchange Server
computer by adding the following entry:

  [EMSMTA]
  Disable=1

This disables WinSock Proxy Client when the MTA makes any network connections.

NOTE: This problem only affects Site Connectors, X.400 Connectors, and Dynamic
RAS Connectors. Other connectors, such as the Internet Mail Connector (Exchange
Server 4.0) or Internet Mail Service (Exchange Server 5.0 and later), are not
affected.


Additional query words: connection, failure

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Keywords          : kbFAQ exc4 exc5 exc55 
Technology        : kbExchangeSearch kbExchange500 kbExchange550 kbExchange400 kbZNotKeyword2
Version           : winnt:4.0,5.0,5.5
Issue type        : kbprb

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