问题表现

可以通过浏览器正常访问github.com。 命令行中执行 git pull 时出现以下错误：

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ssh: connect to host github.com port 22: Operation timed out
fatal: Could not read from remote repository.

核心解决步骤

第一步：验证 SSH 端口封锁

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nc -vz github.com 22
  • 预期正常响应：Connected to github.com...
  • 异常响应：Operation timed out 表示端口 22 被阻断: nc: connectx to github.com port 22 (tcp) failed: Operation timed out

第二步：配置 SSH over 443 端口

  1. 创建 SSH 配置文件
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vi ~/.ssh/config
  1. 写入配置内容
Host github.com
  Hostname ssh.github.com
  Port 443
  User git

第三步：测试新配置

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ssh -T git@github.com
  • 如果有询问是否修改known_hosts, 输入 yes ： 
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    This host key is known by the following other names/addresses:
  ~/.ssh/known_hosts:28: github.com
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
  • 成功标志：Hi username! You've successfully authenticated...

补充方案

使用 HTTPS 协议代替 SSH

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git config --global url."https://github.com/".insteadOf git@github.com: