用xshell连接linux服务器失败 Could not connect to '112.74.73.194' (port 22): Connection failed.

用XSHELL连接linux服务器出现以下错误

Connecting to 42.51.xxx.xxx:22...

Connection established.

To escape to local shell, press 'Ctrl+Alt+]'.

Socket error Event: 32 Error: 10053.

Connection closing...Socket close.

Connection closed by foreign host.

Disconnected from remote host(42.51.xxx.xxx:22) at 20:00:30.

Type `help' to learn how to use Xshell prompt.

操作：用SSH工具连接linux电脑出现的问题：Read from socket failed: Connection reset by peer

起因：改变了系统权限 chmod 777 -R 

解决办法：#chmod 400 /etc/ssh/*

重新连接 成功！！！

重启SSH

service sshd restart

注意：修改# chmod 770 /etc/ssh/ssh_host_dsa_key.pub

          # chmod 770 /etc/ssh/ssh_host_rsa_key.pub

重启网关

service network restart

忠告：linux系统文件的权限请勿乱改。