Help ReadyNAS NV+ as FTP server using Apple Time Capsule

I am setting this up for somebody else. I followed http://www.readynas.com/?p=1682 to configure the ReadyNAS RND4000 NV+ and then followed http://manuals.info.apple.com/en_US/Designing_AirPort_Networks_10.5-Windows.pdf starting on page 54 to limited success. At times I could log into the FTP server and it would Auth, but then timeout. Swapped it out with my Netgear WNR2000 and configured it and it works great. What am I missing on the Apple Time Capsule that only took me 5min to do on the WNR2000? Called Apple Care and they said they could not help since they do not provide phone support for FTP. I have spent nearly 6hrs on this and all I know is that I had it working within 5min using my WNR2000, but they really want to use their Time Capsule and I just can not get it to work.