Ftp Connection Timeout

[philmetz]

I am creating a ftp server on my PC using Serv-U. Now when i plug in the internet connection dirrectly into my PC and someone trys to connect to my FTP server to view my files they can c it all. But once i go behind the router (BEFW11S4v4) and they try connect once again they cant. they get time outs and permission denied. I can even see someone is trying to connect using the serv-U server. But they cant see my folders. It times out. In my router i went to the 'Application and Gaming' tab and the the 'Port Range Forwarding' and forwarded that to my PC ip address which i put static on my PC.
Port range: Start 21, End 21.
Whats going on?
What should i do?

Thanks
Phil

PS: Router Firmware Version: 1.52.02
ROUTER: Wireless-B Broadband Router BEFW11S4