sz 下载命令， rz上传命令的安装
sudo apt-get install lrzsz
1. 检查sshd服务的状态以及端口是否正常, 如下为正常状态
sudo netstat -nlp | grep :22
henry@henry-Latitude-D430:~$ netstat -nlp | grep 22
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN -
tcp6 0 0 :::22 :::* LISTEN -
如果没有，则先重启ssh服务， 如果没有装ssh服务，则sudo apt-get install ssh
/etc/init.d/sshd restart
2. 检查防火墙是否开启
查看防火墙状态
henry@henry-Latitude-D430:~$ sudo ufw status
Status: active
偿试关闭防火墙
henry@henry-Latitude-D430:~$ sudo ufw disable
Firewall stopped and disabled on system startup
henry@henry-Latitude-D430:~$ sudo ufw status
Status: inactive
开启防火墙命令:
henry@henry-Latitude-D430:~$ sudo ufw enable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
Firewall is active and enabled on system startup
henry@henry-Latitude-D430:~$ sudo ufw status
Status: active