打开sshd配置文件
sudo vim /etc/ssh/sshd_config
找到下面两行
#ClientAliveInterval 0
#ClientAliveCountMax 3
取消注释
ClientAliveInterval 30
ClientAliveCountMax 86400
centos7重启sshd
sudo systemctl restart sshd.service
启动sshd
sudo systemctl start sshd.service
设置开机自启
sudo systemctl enable sshd.service
