> root@garfield:~$ ftp unst.homelinux.com
> Connected to unst.homelinux.com.
> 220 ProFTPD 1.3.0 Server (Siegfried) [::ffff:192.168.17.102]
> Name (unst.homelinux.com:xxxxxxx): unst
> 331 Password required for unst.
> Password:
> 230 User unst logged in.
> Remote system type is UNIX.
> Using binary mode to transfer files.
> ftp> ls
> 229 Entering Extended Passive Mode (|||32895|)
> 200 EPRT command successful
> 425 Unable to build data connection: Invalid argument
>
>   
>
just for trouble shooting, could you try:

1. give PASV as the first command, before ls
2. use another client or two - on UNIX, i like lftp for it's bash-like 
completion function goodness

Somehow I think this problem is beyond m0n0...

Sven