Microsoft KB Archive/222134

= XADM: Unable to Establish Proxy Functionality with Exchange Server Behind Proxy Server =

Article ID: 222134

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
 * Microsoft Proxy Server 2.0 Standard Edition

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This article was previously published under Q222134



SYMPTOMS
An installation of Exchange Server behind Proxy Server requires modification of MX records and configuration of the Wspcfg.ini files on the Exchange Server computer as explained in the following Microsoft Knowledge Base article:

181847 XADM: How to Configure Microsoft Exchange Server with Proxy Server

On some occasions when the Winsock Proxy client is installed after Exchange Server has been configured, you may experience some of the problems listed below. In other instances, the Winsock Proxy client and Exchange Server may appear to work correctly, however, some anomalous behavior such as a temporary loss of connection to the ISP may occur.

Symptoms of this Behavior

 * Can send mail but not receive mail, or vice versa.
 * Can neither send nor receive mail.
 * May have had perfect functionality before installing Winsock Proxy Client.
 * Can telnet to Port 25 or 110 but still cannot send or receive mail.

These symptoms may occur even though all of the following conditions are true:
 * Chkwsp32 confirms a connection and Mspclnt.ini is configured properly on the Exchange Server computer.
 * Wspcfg.ini is configured properly on the Exchange Server computer.
 * Files may have been renamed and recreated without success.



CAUSE
It is possible that the Internet Mail Service (Internet Mail Connector in Exchange Server 4.0) isn't bound properly to the WinSock Proxy client.



RESOLUTION
First, attempt to remove and reinstall the Internet Mail Service, renaming and reconfiguring the .ini files mentioned in the "Symptoms" section. If, however, this does not resolve the issue, try the following steps:
 * 1) Record all Internet Mail Service settings or do an Admin dump in the Microsoft Exchange Server Administrator program.
 * 2) Remove the Internet Mail Service.
 * 3) Remove the WinSockProxy client.
 * 4) Reboot.
 * 5) Reinstall the WinSockProxy Client.
 * 6) Reboot.
 * 7) Reinstall the Internet Mail Service.
 * 8) Modify the Wspcfg.ini as described in Q181847, and confirm functionality.
 * 9) Telnet to Port 25 and port 110.
 * 10) Send and receive mail.

Additional query words: IMS IMC

Keywords: kbhowto KB222134

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