How to Use an Intranet FTP Server or ISA Server Behind a Proxy Server (209400)

MORE INFORMATION

1. Disable the FTP Publishing service on the proxy server.
2. Install the Winsock Proxy client on the FTP server.
3. Create a file named Wspcfg.ini with the following contents. Place the file in the same folder as the Inetinfo.exe file on the FTP server.

   [inetinfo]
   serverbindtcpports=21,20
   localbindtcpports=20
   killoldsession=1
   persistent=1
   forcecredentials=1

4. If Access Control is not being used, skip to step 5. If Access Control is going to be enabled for Winsock on the proxy server, use the Credtool utility to specify the user credentials.
   
   You cannot set the account on which the service can run in the properties for the FTP Publishing server (using the Services tool in Control Panel). You can do this with the Credtool utility. The account you use can be an existing Microsoft Windows NT domain account or a new one. You just need an account to use as you do when you are configuring Microsoft Exchange behind a proxy server.
5. In the Winsock properties on the proxy server, click Add on the Protocols tab to create a new protocol. Use the following settings:

   Protocol Name: FTP Server
   Initial Connection: 21 TCP Inbound
   Click Add in this dialog box and add the following items:
   Port Range: 1025-5000
   Type: TCP
   Direction: Inbound

6. Enable Packet Filtering and add the following custom filters:

      Protocol   Direction   Local port                 Remote port
      -------------------------------------------------------------
      TCP        Both        20                         Any
      TCP        In          21                         Any
      TCP        Both        Dynamic port (1025-5000)   Any
   					

7. After you configure the proxy server, you must obtain and install the hotfix listed in the following article in the Microsoft Knowledge Base:

   236001 Err Msg: 425 Can't Open Data Connection