failed to start openssh daemon on suse gnome 13.1

Hi, everybody

I'm trying to start my sshd server because i need to connect to my ssh server from a network device (switch) and download a new firmware with sftp connection.
I've followed this wiki: https://en.opensuse.org/SDB:SFTP_server_with_Chroot but i'm not able to configure the sshd server.
This is the systemctl status sshd.service:

systemctl status sshd.service
sshd.service - OpenSSH Daemon
Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled)
Active: failed (Result: start-limit) since mar 2014-03-11 15:03:14 CET; 52min ago
Process: 3525 ExecStart=/usr/sbin/sshd -D $SSHD_OPTS (code=exited,
status=255)
Process: 3521 ExecStartPre=/usr/sbin/sshd-gen-keys-start (code=exited,
status=0/SUCCESS)
Main PID: 3525 (code=exited, status=255)
CGroup: /system.slice/sshd.service

: sshd.service: main process exited, code=exited, status=255/n/a
: Unit sshd.service entered failed state.
: sshd.service holdoff time over, scheduling restart.
: Stopping OpenSSH Daemon...
: Starting OpenSSH Daemon...
: sshd.service start request repeated too quickly, refusing to start.
: Failed to start OpenSSH Daemon.
: Unit sshd.service entered failed state.

Any help will be appreciated
Regards
Max