解决Push代码到Github时发生【connect to host github.com port 2/2:Operation timed outfatal】错误的问题
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今天在使用 Hexo 推送博客到 Github 仓库的时候，一直推送不成功，老是报如下错误：
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ssh: connect to host github.com port 22: Operation timed out fatal: Could not read from remote repository.
Please make sure you have the correct access rights and the repository exists.
问题场景还原：
查看 ssh 链接，打开终端，执行如下命令
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ssh -T git@github.com
等待一会，终端大概发生如下错误信息
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ssh: connect to host github.com port 22: Connection timed out
解决步骤：
1、新建 config 文件：
找到.ssh 文件夹，Mac 中路径是 ~/.ssh，新建一个 config 文件，不带后缀。
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touch config
2、修改 config 文件：
打开 config 文件，添加下列代码，注意 User 后面的邮箱改为你的邮箱,其他配置不需改变
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Host github.com User xxx@qq.com Hostname ssh.github.com PreferredAuthentications publickey IdentityFile ~/.ssh/id_rsa Port 443
3、再次执行下面代码，通过 443 端口尝试连接：
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ssh -T git@github.com
显示下面提示：
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The authenticity of host '[ssh.github.com]:443 ([20.200.200.100]:443)' can't be established. ECDSA key fingerprint is SHA256:XXXXXXXX/XXXXXX/XXXXXXX. Are you sure you want to continue connecting (yes/no/[fingerprint])? yes Warning: Permanently added '[ssh.github.com]:443,[20.200.200.100]:443' (ECDSA) to the list of known hosts.
4、再次执行下面代码：
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ssh -T git@github.com
5、回应下面消息，说明成功了
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Hi xxx! You've successfully authenticated, but GitHub does not provide shell access.