I have been trying to get a PASV connection to an FTP server behind m0n0wall
and am not having much luck.  I have configured my PassivePortRange on the
FTP server per MS article. 

http://support.microsoft.com/?id=555022

I have NAT configured as

WAN  TCP  21 (FTP)  192.168.2.21  21 (FTP)  FTPTEST  
WAN  TCP  20000-21000 (FTP)  192.168.2.21  20000-21000 (FTP)  PASSVTEST  

And Rules

TCP  *  *  192.168.2.21  21 (FTP)  NAT FTPTEST
TCP  *  *  192.168.2.21  20000 - 21000  NAT PASVTEST

I am using FileZilla and I receive the following

Response:	220-Microsoft FTP Service
Response:	220 BI FTP Test Site
Command:	USER dpuckett
Response:	331 Password required for dpuckett.
Command:	PASS **************
Response:	230-Hello
Response:	230 User dpuckett logged in.
Command:	FEAT
Response:	211-FEAT
Response:	    SIZE
Response:	    MDTM
Response:	211 END
Command:	SYST
Response:	215 Windows_NT
Status:	Connected
Status:	Retrieving directory listing...
Command:	PWD
Response:	257 "/" is current directory.
Command:	PASV
Response:	227 Entering Passive Mode (192,168,2,21,78,51).
Command:	TYPE A
Response:	200 Type set to A.
Command:	LIST
Response:	425 Can't open data connection.
Error:	Could not retrieve directory listing


Can anyone tell me what I am doing wrong?
Thanks