git pull 报错：ssh: connect to host github.com port 22: Connection timed out

在执行 git pull 时提示错误：

ssh: connect to host github.com port 22: Connection timed out

解决方案：

1. 添加 config 文件
   vim ~/.ssh/config

2. 添加如下内容

Host github.com
 Hostname ssh.github.com
 Port 443

---

ssh: connect to host github.com port 22: Connection timed out