FTP not working behind Ubuntu+Shorewall

I have a PC router that runs Ubuntu Server 7.04 and Shorewall as a firewall. On one of computers connected to it I run a FTP server. the problem is i cannot connect to it from outside. the port used for ftp is 50005 and the ip of that computer is 192.168.0.3. i can however connect to it from another computer on LAN. here are my rules:

Code:

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#ACTION        SOURCE                DEST                PROTO        DEST        SOURCE                ORIGINAL        RATE                USER/
#                                                PORT(S)        PORT(S)                DEST                LIMIT                GROUP
#SECTION ESTABLISHED
#SECTION RELATED
SECTION NEW
SSH/ACCEPT        all        $FW
Webmin/ACCEPT        all        $FW
DNS/ACCEPT        loc        fw
#Web/ACCEPT        all        all
Ping/ACCEPT        loc        all
Ping/REJECT:info        all        $FW
Ping/ACCEPT        $FW        all
DNAT        net        loc:192.168.0.3        tcp        50000:50005
DNAT        net        loc:192.168.0.3        udp        50000:50005
NTP/ACCEPT        all        all

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ports 50000-50004 are used for torrents, ed2k and a couple of other things, which work fine. what am i missing here? i updated to latest shorewall version and still nothing. Please help me!!!