一般流程,如果有问题,按照下面步骤排查一遍即可
service ssh status
service ssh start
service ssh restart
service ssh stop
如果没有安装
sudo apt-get install openssh-server
配置相关信息
vi /etc/ssh/sshd_config
netstat -nlp |grep ':20'
service ufw status
打开某个端口
sudo ufw allow smtp
sudo ufw allow 22/tcp
sudo ufw allow 53
sudo ufw allow from 192.168.1.100
sudo ufw allow proto udp 192.168.0.1 port 53 to 192.168.0.2 port 53
禁用或关闭某个端口
sudo ufw delete allow 53
sudo ufw delete allow 80/tcp
sudo ufw deny smtp
sudo ufw delete allow smtp
sudo ufw delete allow from 192.168.254.254
- 关闭防火墙
sudo ufw disable
sudo ufw enable