[操作疑難] command to shut down DS916+

我部ds212+可以喺windows用以下command shut down:
plink "NAS ip address" -l "account with admin privilege" -pw "password" poweroff

最近買左部ds916+用返同樣command 出error:
Could not chdir to home directory /var/services/homes/"XXX": No such file or directory
poweroff: Need to be root

account 已經有admin privilege. 我想整個bat喺卓面一㩒就熄nas, 請問有無其他方法? Thanks.