Setting up a chroot sftp on debian server

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http://serverfault.com – I'm trying to allow a user "user" to access my server by either sftp or ssh. I want to jail them into a directory with chroot. I read the instructions here however it does not work. I did the following: useradd user modify /etc/ssh/sshd_config and added Match User user ForceCommand internal-sftp ChrootDirectory /home/duke/aa/smart to the bottom of the file changed the subsystem line to Subsystem sftp internal-sftp restarted sshd with /etc/init.d/ssh restart logged in with ssh as user "user" with PuTTY Putty says "Server unexpectly closed the connection". Why is this and how c (HowTos)