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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
