Thanx, I will try the DMZ - However I pulled the D-Link out and put the Linksys back in as I needed access to the FTP server.
Regarding the firewall, I was running Windows XP Firewall with the FTP server software as an exception as well as UPnP framework. I will try turning this off first however it doesn't interfere with access through the Linksys router. Also, as I noted in my original post, I can access the server from behind the router on my local LAN with the FTP server's XP firewall running.
Good tips, thanx.