Failed to connect to github.com port 443: Connection refused

回答: 当出现"Failed to connect to github.com port 443: Connection refused"错误时，可能有几种解决方法。首先，可以尝试关闭代理，因为代理工具可能会导致连接问题。可以尝试重置或取消代理设置来解决问题。\[1\]

另外，还可以通过修改hosts文件来解决该问题。可以使用IP查询工具来获取GitHub最新的真实地址，并将其添加到hosts文件中。这样可以确保连接到正确的GitHub地址。\[2\]

此外，如果出现"gnutls_handshake() failed: Error in the pull function"错误，可以尝试将地址中的"https"改为"git"。如果在git clone子模块时遇到此问题，可以打开.gitmodules文件，并将submodule中的url进行相应的修改。\[2\]

最后，如果电脑开启了代理，例如翻墙软件等，也可能导致连接问题。可以尝试取消全局代理来解决该问题。可以使用以下命令取消全局代理设置：git config --global --unset http.proxy和git config --global --unset https.proxy。\[3\]
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