查看ssh服务开启状态

root@dbaudit-desktop:/etc/init.d# /etc/init.d/ssh status

 * sshd is running

或者这样检查：root@dbaudit-desktop:/etc/init.d# service ssh status

ssh start/running, process 748

或者这样检查：

root@dbaudit-desktop:~# netstat -apntlu

激活Internet连接 (服务器和已建立连接的)

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name

tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      26913/sshd

tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      1239/cupsd

tcp        0      0 0.0.0.0:636             0.0.0.0:*               LISTEN      1139/slapd

tcp        0      0 0.0.0.0:389             0.0.0.0:*               LISTEN      1139/slapd

tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN      731/mysqld

tcp        0      0 192.168.51.95:49362     192.168.51.207:22       ESTABLISHED 3763/ssh

tcp        0      0 192.168.51.95:49363     192.168.51.207:22       ESTABLISHED 3788/ssh

tcp        0      0 192.168.51.95:22        192.168.51.113:5419     ESTABLISHED 25662/3

tcp6       0      0 :::80                   :::*                    LISTEN      1361/apache2

tcp6       0      0 :::22                   :::*                    LISTEN      26913/sshd

tcp6       0      0 ::1:631                 :::*                    LISTEN      1239/cupsd

tcp6       0      0 :::636                  :::*                    LISTEN      1139/slapd

tcp6       0      0 :::389                  :::*                    LISTEN      1139/slapd

udp        0      0 0.0.0.0:50138           0.0.0.0:*                           764/avahi-daemon: r

udp        0      0 0.0.0.0:5353            0.0.0.0:*                           764/avahi-daemon: r

或者这样检查：

root@dbaudit-desktop:~# ps -ef | grep ssh

root      2217  2181  0 08:48 ?        00:00:00 /usr/bin/ssh-agent /usr/bin/dbus-launch --exit-with-session gnome-session

root      3669  3625  0 08:58 pts/1    00:00:00 ssh root@192.168.51.207

root      3680  2403  0 08:58 pts/0    00:00:00 ssh root@192.168.51.207

root      3763  2403  0 08:59 pts/0    00:00:00 ssh root@192.168.51.207

root      3788  3625  0 08:59 pts/1    00:00:00 ssh root@192.168.51.207

root     25662     1  0 11:53 ?        00:00:00 sshd: root@pts/3

root     26003     1  0 11:54 ?        00:00:00 /usr/sbin/sshd

root     26153 25890  0 11:55 pts/3    00:00:00 grep --color=auto ssh

或者直接用putty看看能不能连接上。注意：关闭远程协助服务后，本次putty登录并不自动断开，但尝试再次登录putty则不会登录上去了。