kex_exchange_identification: Connection closed by remote host

当使用ssh -T git@github.com时出现以上报错

尝试以下命令

ssh -T -p 443 git@ssh.github.com

如果显示Hi <username>! You've successfully authenticated, but GitHub does not provide shell access.则说明连接成功

强大的GFW阻止了22端口，我们可以将github的连接改为443:

# ~/.ssh/config
Host github.com
    Hostname ssh.github.com
    Port 443
    User git

参考资料

• Github社区Issue
• GitHub文档