problem with bzr push when using sftp

[Matt Funk]

Hi,
i am running on a windows machine and i am trying to a windows server
2008 r2 machine. The server machine has winsshd (ssh/sftp server
running). When i try to sftp into the machine via filezilla it works fine.
However, when i do bzr push , i get a prompt for my password and then :
bzr: ERROR: Connection error: Unable to authenticate to SSH host as
myusername at mymachine

Does anyway have similar issues? I tend to think that it is a bazaar
client thing as things work fine with filezilla but i could be wrong of
course.

thanks
matt