RSA1 keys and sftp - two errors

[Jeff <rs...@pr...>]

Help!  I've travelled 98% of the journey, only to get hit at the last =
turn!!
For background, chroot works a treat, sftp working no problems with =
rssh,
and users can happily log in and wander around their (chroot'd) homes.  =
File
uploads/downloads also going fine.

However, I have one instance where the user login is automated (in =
scripts),
and therefore the user wants to use a passphrase-less RSA1 key (I know,
don't start on me with the security implications!!).  Anyway, I install =
the
key on the server (in their authorized_keys file), and do some tests.
Here's what I get (in /var/log/messages - dates/times/names removed for
sanity):

Sshd(pam_unix): authentication failure; logname=3D uid=3D0 euid=3D0 =
tty=3DNODEVssh
ruser=3D ruser=3D<myhostname> user=3D<username>
Sshd(pam_unix): session opened for user <username> by (uid=3D500)
Rssh: setting log facility to LOG_USER
Rssh: line 42: configuring user <username>
Rssh: setting <username's> umask to 011
Rssh: allowing sftp to user <username>
Rssh: chrooting <username> to /home/<username>
Rssh: user <username> attempted to execute forbidden commands
Rssh: command: sftp
Sshd(pam_unix): session closed for user <