proxy and desitnation on the same host

Hi,

I am trying to setup ftp-proxy on multiple hosts on port 21
The main ftp server (pure-ftpd) is also running on the same hosts on 
port 211

The idea is that the user may connect to any ftp server and get proxied 
to the correct one via LDAP lookups. The destination server may or may 
not be publicly reachable.


All is working fine if

user's destination is serverY and he connected to serverX

but if

user's destination is server Y and he connects to serverY
the login is ok, but the user cannot see no data
Gets an "425 Can't open data connection." message

Is this a limitation of I have misconfigured the ftp proxy/server.

best regards and thanks in advance


__EXAMPLE__

In this example the user's destination server is mars and destination 
port is 211


-- connecting to venus

bash$ ftp venus
Connected to venus.
220 venus FTP server (Version 1.8 - 2002/01/14 20:09:00) ready.
Name (venus:atif): [email protected]
331 User [email protected] OK. Password required
Password:
230-User [email protected] has group access to:  1003
230-This server supports FXP transfers
230 OK. Current restricted directory is /
ftp> ls
200 PORT command successful.
150 Connecting to port 32796
.
..
public_html
x
y
z
226-Options: -a
226 6 matches total
29 bytes received in 0.023 seconds (1.22 Kbytes/s)

-- connecting to mars

bash$ ftp mars
Connected to mars.
220 mars FTP server (Version 1.8 - 2002/01/14 20:09:00) ready.
Name (mars:atif): [email protected]
331 User [email protected] OK. Password required
Password:
230-User [email protected] has group access to:  1003
230-This server supports FXP transfers
230 OK. Current restricted directory is /
ftp> ls
200 PORT command successful.
425 Can't open data connection.



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