DSM 6.02 SCP登陆问题

ESXI装了黑群晖6.02。用WINSCP登陆的SCP协议不能登陆。关键日志如下：
. 2017-02-07 18:09:42.599 --------------------------------------------------------------------------
. 2017-02-07 18:09:42.599 WinSCP 版本5.7.7 (构建版本 6257) (OS 10.0.14393 - Windows 10 Pro)
. 2017-02-07 18:09:42.600 Time zone: Current: GMT+8 (中国标准时间), No DST
. 2017-02-07 18:09:42.600 Login time: 2017年2月7日 18:09:42
. 2017-02-07 18:09:42.600 --------------------------------------------------------------------------

! 2017-02-07 18:09:43.017 Using username "root".
. 2017-02-07 18:09:43.032 Prompt (password, "SSH password", <no instructions>, "密码(&P)：")
. 2017-02-07 18:09:43.032 Using stored password.
. 2017-02-07 18:09:43.082 Sent password
. 2017-02-07 18:09:43.149 Access granted
. 2017-02-07 18:09:43.149 Opening session as main channel
. 2017-02-07 18:09:43.204 Opened main channel
. 2017-02-07 18:09:43.247 Started a shell/command
. 2017-02-07 18:09:43.284 --------------------------------------------------------------------------
. 2017-02-07 18:09:43.284 Using SCP protocol.
. 2017-02-07 18:09:43.285 Doing startup conversation with host.
! 2017-02-07 18:09:43.285 Permission denied, please try again.
. 2017-02-07 18:09:43.285 Server sent command exit status 1
. 2017-02-07 18:09:43.285 Disconnected: All channels closed
* 2017-02-07 18:09:43.390 (EFatal)

请问大神如何解决。
系统做过以下修改：
使用synouser --setpw root 命令把ROOT密码和ADMIN密码修改成一样。
chmod 660 /etc/sudoers
修改过sudoers文件
# Allow members of group administrators to execute any command
%administrators ALL=NOPASSWD:ALL