DOCUMENT:Q181847  11-APR-2001  [exchange]
TITLE   :XADM: How to Configure Exchange Server with Proxy Server
PRODUCT :Microsoft Exchange
PROD/VER::2.0,4.0,5.0,5.5
OPER/SYS:
KEYWORDS:kbusage

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The information in this article applies to:

 - Microsoft Exchange Server, versions 4.0, 5.0, 5.5 
 - Microsoft Proxy Server version 2.0 
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SUMMARY
=======

This article explains how to configure Microsoft Exchange Server to operate
behind Proxy Server 2.0 to handle incoming Internet client requests (this is
known as "reverse-hosting").

Simple Mail Transfer Protocol (SMTP) servers and Post Office Protocol (POP)
clients on the Internet must be configured to contact the Proxy Server computer
through the appropriate port in order to communicate with the Exchange Server
computer.

NOTE: this article is specifically for running Exchange Server behind Proxy
server. If the two products are to be installed on the same computer, this
article does not apply.

In addition, versions of the Wspcfg.ini file need to be placed in the directory
where the server application's .exe files are installed. Because Exchange Server
has more than one .exe file, more than one Wspcfg.ini file is needed in specific
directories.

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

1. Install Winsock proxy client from the proxy server Mspclnt share.

2. Copy two instances of the Wspcfg.ini file.

3. Add the following section to the end of the first Wspcfg.ini file. This
   section is required for the Exchange SMTP service:

   [Msexcimc]
   ServerBindTcpPorts=25
   Persistent=1
   KillOldSession=1
 

4. Place this file in the directory where the Msexcimc.exe file is located. The
   default directory path is \Exchsrvr\Connect\Msexcimc\Bin.

5. Restart the Microsoft Exchange IMS Service.

6. Confirm that the SMTP port is bound to port 25 on the Proxy Server computer.
   Do this by typing "telnet <proxy external IP> 25" (without the
   quotation marks), where <proxy external IP> is the external IP address
   of the Proxy server.

7. The second Wspcfg.ini file contains entries needed for the Exchange Store
   (Store.exe), as follows:

   [Store]
         ServerBindTcpPorts=110,119,143
         Persistent=1
         KillOldSession=1

   Additional ports can be listed in this because Store.exe sets POP mail on port
   110, NNTP on port 119, and IMAP4 on port 143.

8. Place this second Wspcfg.ini file in the directory where Store.exe is
   located. The default directory path is \Exchsrvr\Bin.

9. Stop and restart the Exchange services, or restart the Exchange Server
   computer, for the new settings to take effect. You should be able to contact
   the Exchange Server computer by connecting to the external IP address on the
   Proxy Server computer using IMAP, NNTP, or POP3 protocols.

10. Verify that your DNS MX records point to the Proxy Server computer and not
   to the Exchange Server computer. Because the MX record is different from the
   regular GetHostByName call, you must configure network TCP/IP properties,
   using Control Panel, to use DNS for the Exchange Server computer. The
   WinSock Proxy client application automatically redirects the DNS MX request.

NOTE: If you have an internal DNS server on your network, you can use DHCP to
configure the internal server. This may enable you to use both internal and
external DNS servers to resolve names on your internal network and on the
Internet.

Additional query words:

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Keywords          : kbusage 
Technology        : kbAudDeveloper kbExchangeSearch kbExchange500 kbExchange550 kbExchange400 kbZNotKeyword2 kbProxyServSearch kbProxyServ200
Version           : :2.0,4.0,5.0,5.5
Issue type        : kbhowto

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