ReadyNAS Remote Duo V2 installation

I have a Duo v2 (5.3.4) and couldn't get the remote access from my Android working either. This was one of the reasons I bought it so was disappointed when it didn't work out of the box. Or even after installing the remote iphone add-on http://www.readynas.com/download/addons/arm/5.3/RemoteiPhone-arm_1.1.bin (The light is green on the add-ons page, but grey when you click on the iphone add-on - I wonder if this means it's not working properly.....)

However after some tinkering I have now got it working. I initially followed the instructions here: http://www.readynas.com/forum/viewtopic.php?f=24&t=58716 to switch proftpd on, but then I started getting the 221 Goodbye message as soon as my Android connected.
After investigating the log file for proftpd, I found that it was rejecting my log in because I didn't have a shell defined against my user account. Instead of setting a shell, I added 'RequireValidShell off' to the pfoftpd.conf file and then voila, I connected and logged in from my Android phone.