服务端，批改 /etc/ssh/sshd_config：
TCPKeepAlive yes
ClientAliveInterval 60
ClientAliveCountMax 3 客户端，批改 /etc/ssh/ssh_config：
Host *
TCPKeepAlive yes
ServerAliveInterval 30
ServerAliveCountMax 5
IPQoS lowdelay throughput 服务端，批改 /etc/ssh/sshd_config：
TCPKeepAlive yes
ClientAliveInterval 60
ClientAliveCountMax 3 客户端，批改 /etc/ssh/ssh_config：
Host *
TCPKeepAlive yes
ServerAliveInterval 30
ServerAliveCountMax 5
IPQoS lowdelay throughput