Trouble FXPing between two ProFTPD servers

[paddy]

Hi,

* FTP server(s) name [ProFTPD], version [1.2.10rc3]
ProFTPD

* timestamped, and side prefixed FTP log (please paste)
With FlashFXP:
[10:33:32] [L] TYPE I
[10:33:32] [L] 200 Type set to I
[10:33:32] [R] TYPE I
[10:33:32] [R] 200 Type set to I
[10:33:32] [L] PASV
[10:33:32] [L] 227 Entering Passive Mode (212,37,1,30,12,212)
[10:33:32] [R] PORT 212,37,1,30,12,212
[10:33:32] [R] 504 Command not implemented for that parameter
<hangs>

With profxp:
::
:: -=- XFER start for 'dirsizes', size 365 bytes -=-
>> PASV
<< 227 Entering Passive Mode (212,37,1,30,214,131).
>> PORT 212,37,1,30,214,131
<< 200 PORT command successful
>> STOR dirsizes
<< 150 Opening BINARY mode data connection for dirsizes
>> RETR dirsizes
<< 150 Opening BINARY mode data connection for dirsizes (365 bytes)
:: >>> XFER running, hit 'a' to abort, 's' to stop after current file <<<
<< 226 Transfer complete.
<< 226 Transfer complete.
:: -=- XFER of 'dirsizes' complete -=-
(no timestamps in this client)

* any other info

I've setup two ProFTPD daemons on two machines and am trying to use FXP to transfer files between the two.

It's just not working when I'm using FlashFXP but with another client (profxp) it works fine.