Mac使用github出现Operation timed out报错

这两天在mac上使用git push命令一直无响应，直到超时出现如下报错，非常让人烦躁。

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.

首先感觉是代理出了问题，找到自己的ip和端口号后使用git config修改，还是一样的报错，只不过port从22变成了我的7890，开始怀疑人生了。

kex_exchange_identification: Connection closed by remote host
Connection closed by 127.0.0.1 port 7890
fatal: Could not read from remote repository.

Please make sure you have the correct access rights

但是在进行以上操作时，浏览器可以正常进入github，说明不是网络问题。使用ssh命令测试端口443能不能连上：

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