connect to host github.com port 22: Connection refused

win10下配置了私匙和公匙，但是没有配置.ssh/config

参考： https://blog.csdn.net/mbuger/article/details/70226712?>

Host github.com  
User xxxxx@xx.com  
Hostname ssh.github.com  
PreferredAuthentications publickey  
IdentityFile ~/.ssh/id_rsa  
Port 443