[root@server55 ~]# w
15:21:57 up 6:55, 7 users, load average: 1.17, 1.46, 1.38
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/1 192.168.2.111 15:20 53.00s 0.04s 0.04s -bash
skill -9 pts/1
/etc/init.d/sshd stop
当别人连着你的ssh，提掉他，然后关闭sshd，别人就不可以连接了
原文：http://www.cnblogs.com/wangjiaxing/p/3996450.html