一般是代理出问题了；
2个命令：
设置全局代理
git config --global http.proxy 127.0.0.1:8080
查看是否成功
git config --get http.proxy
127.0.0.1:8080
Failed to connect to github.com port 443: Timed out
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Failed to connect to github.com port 443: Timed out
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【Github】问题解决：Failed to connect to github.com port 443: Operation timed out
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