MAC电脑连接linux出错

Last login: Tue Nov 17 17:34:45 from 172.16.110.195
seanPC:~ akira$ ssh akira@localhost
Password:
Last login: Tue Nov 17 17:35:11 2015
seanPC:~ akira$ exit
logout
Connection to localhost closed.
seanPC:~ akira$ ssh root@115.29.237.108
ssh: connect to host 115.29.237.108 port 22: Connection refused
seanPC:~ akira$










问题：ssh 连接本地机器 可以连接成功，连接ecs 就出现下述错误
ssh: connect to host 115.29.237.108 port 22: Connection refused


有没有曾经遇到同样问题的朋友呢，请告知思路的方向，不胜感激


ps：系统偏好设置里的共享 已经勾选了远程登录