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FTP Proxy connecting to IIS 6 FTP server

Hi, we host an FTP server in IIS 6. We have a client trying to connect that needs to go through an FTP proxy do to firewall restrictions at their office. They are using WS_FTP Pro to connect but are unable to get past the LIST command when connecting.

I went through the steps in this MIcrosoft KB: http://support.microsoft.com/default.aspx?scid=kb%3Ben%3B555022 and it still wasn't working.

I have opened up and pointed the port range I chose on our firewall and do not have Windows firewall running on the server. I haven't receive word back if that fixed it yet.
I am posting the connection log
Does anyone have any ideas?
USER xxxxxx@ftp.xxxxx.com
331-(----GATEWAY CONNECTED TO ftp.xxxxxx.com----)
331-(220 Microsoft FTP Service)
331 Password required for xxxxxxxx.
PASS (hidden)
230 User xxxxxxx logged in.
257 "/" is current directory.
Host type (I): Microsoft NT
PORT 3,175,149,97,19,27
200 PORT command successful.
150 Opening ASCII mode data connection for /bin/ls.

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1 Solution
obviously commands (port 21) are ok and data is not (port 20 in active mode)
tell him to open port 20 or use passive mode
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