|First make sure that you can access it internally. Open a command prompt on one of the PCs and type:|
ftp 192.168.2.3 press enter
Does it give you a login prompt? If so, were you able to login?
If all that worked and you want to try it from outside your network, you can't use that IP address. You have to test it with your external IP but even if you have it setup correctly, that IP is subject to change. You may have to use dyndns or another solution.