PRET Help!

[cyphur]

Ok I im getting this error and yes I did use search but not very helpful

[L] 501- ==YOU'RE BEHIND A NAT ROUTER==
[L] 501- Configure the firewall settings of your FTP client
[L] 501- to use your real IP: 67.87.116.178
[L] 501- And set up port forwarding in your router.
[L] 501- Or you can just use a PRET capable client, see
[L] 501 http://drftpd.org/ for PRET capable clients

Im using FlashFxp 3.0 Build 1015
WinXP
Running behind Router
CAble