iPhone cannot add FTP source

Hi,

For some reason I cannot add a FTP source to my iPhone. Smb works Ok

I get the error "could not retrieve directory information. This could be due to the network not being connected."

I have setup xbmc on my windows 7 laptop and I can add a FTP without any problems

Can anyone provide any advice how I might solve this problem.

Any help would be very much appreciated

Many thanks
Nick