第一步：打开ipaddress.com,查询如下两个域名，并分别记录下其对应的ip：
1、github.com
2、github.global.ssl.fastly.net
第二步：更新host文件
192.30.253.112 github.com
151.101.185.194 github.global.ssl.fastly.net
第三步：清理下DNS，再试一下。
ipconfig /flushdns
win10下 Failed to connect to github.com port 443: Timed out问题解决办法
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win10下 Failed to connect to github.com port 443: Timed out问题解决办法
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