问题
Git克隆提交出现 ssh connect to host github.com port 22 Operation timed out
ssh协议 从GitHub克隆自己的代码时，报错如下：
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Cloning into 'retrofit2-gson-convert'...
ssh_dispatch_run_fatal: Connection to 52.74.223.119 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.
解决方案
在.ssh目录下新建config文本，输入如下内容：
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Host github.com
User YourEmail@163.com
Hostname ssh.github.com
PreferredAuthentications publickey
IdentityFile ~/.ssh/id_rsa
Port 443
:wq保存退出即可
实际上，在这一步时已经解决本人的问题了
如果还不能使用，重试设置config
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$ git config --global user.name "XXX"
$ git config --global user.email XXX@xx.com