Microsoft KB Archive/254909

= XCON: Connectors Stop Responding with Event 9301 After WinSock Proxy Client Is Installed =

Article ID: 254909

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 4.0 Standard Edition
 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q254909





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

Keywords: kbfaq kbprb KB254909

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