GitHub 通过 443 端口的 SSH 访问异常
$ git push origin main
ssh: connect to host ssh.github.com port 443: Connection refused
fatal: 无法读取远程仓库。
请确认您有正确的访问权限并且仓库存在。
要测试通过 HTTPS 端口的 SSH 是否可行，请运行以下 SSH 命令：
$ ssh -T -p 443 git@ssh.github.com
> Hi username! You've successfully authenticated, but GitHub does not
> provide shell access.
如果这样有效，万事大吉！ 如果无效，您可能需要遵循我们的故障排除指南。
启用通过 HTTPS 的 SSH 连接
如果您能在端口 443 上通过 SSH 连接到 git@ssh.github.com，则可以覆盖您的 SSH 设置以强制与 GitHub.com 的任何连接均通过该服务器和端口运行。
要在 SSH 配置文件中设置此设置，请在 ~/.ssh/config 编辑该文件，并添加以下部分：
Host github.com
Hostname ssh.github.com
Port 443
User git
您可以通过再次连接到 GitHub.com 测试此项是否有效：
$ ssh -T git@github.com
> Hi username! You've successfully authenticated, but GitHub does not
> provide shell access.
打印详细信息
ssh -vT git@github.com
错误排查
$ ssh -vT git@github.com
OpenSSH_8.2p1 Ubuntu-4ubuntu0.4, OpenSSL 1.1.1f 31 Mar 2020
debug1: Reading configuration data /home/rudy/.ssh/config
debug1: /home/rudy/.ssh/config line 15: Applying options for github.com
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to ssh.github.com [::1] port 443.
debug1: connect to address ::1 port 443: Connection refused
debug1: Connecting to ssh.github.com [127.0.0.1] port 443.
debug1: connect to address 127.0.0.1 port 443: Connection refused
ssh: connect to host ssh.github.com port 443: Connection refused