ssh连接报Connection closed by foreign host.

今天连接linux时居然连不上，报错信息是：

Connecting to 192.168.16.133:22...Connection established.To escape to local shell, press 'Ctrl+Alt+]'.Connection closed by foreign host.Disconnected from remote host(hadoop3) at 10:56:11.Type `help' to learn how to use Xshell prompt.

查了一下终于找到了解决办法，只需要一些命令就可以了：

    cd /etc/ssh    sudo chmod 644 ./*    sudo chmod 600 ssh_host_dsa_key    sudo chmod 600 ssh_host_rsa_key    sudo chmod 755 .    /etc/init.d/sshd restart

完成后在重新连接就行了。