Microsoft KB Archive/170021

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Proxy Not "Listen" for Inbound Connections to Servers on the Intranet

Article ID: 170021

Article Last Modified on 8/13/1999


  • Microsoft Proxy Server 1.0 Standard Edition

This article was previously published under Q170021


The Microsoft Proxy Server version 1.0 currently does not have the capability to "listen" for a connection on behalf of an internal server. The Proxy Server 1.0 will only remote requests from internal clients to the Internet.

For example, SMTP would be able to send mail through the Proxy Server but not listen for incoming mail. Therefore, you cannot install a Microsoft Exchange Server behind the Proxy Server, because the Internet Mail Connector (IMC) will not receive incoming mail.


Use one of the following methods:

  • Install the mail server on another computer that is directly connected to the Internet. The mail clients on the intranet will be able to connect with POP or SMTP through the Proxy server.


  • Install the mail server on the Microsoft Proxy Server. NOTE: It will be exposed to all networks the Proxy Server is connected to.

The first option is the preferred method, because it is good practice to minimize the number of services running on the Proxy Server. Extra services on the Proxy Server provide more points of access for attack from potential intruders.


For additional information, please see the following articles:

164141 Using SMTP Mail Servers with Microsoft Proxy Server 1.0

165057 XCON: Can't Connect Exchange Server Sites w/ Proxy Server

For information on how to configure SMTP with the Proxy Server refer to the Proxy Server documentation.

Keywords: kbprb KB170021