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升级OpenSSH最好先装下TelnetServer

CentOS 6 安装方式

安装包

yum install telnet-server

启动服务

chkconfig telnet on
service xinetd start

CentOS 7 安装方式

安装包

yum install telnet-server
yum install xinetd

启动服务

systemctl enable telnet.socket
systemctl start telnet.socket
systemctl start xinetd

测试连接

wutong@tongwoo:~$ telnet 10.211.55.6
Trying 10.211.55.6...
Connected to centos-linux-65.shared.
Escape character is '^]'.
Password:

连接不上注意防火墙有没有禁掉23端口