依次将如下两条语句复制到git中后，点击回车
git config --global --unset http.proxy
git config --global --unset https.proxy
win+r打开cmd，将ipconfig/flushdns复制，点击回车，清理DNS缓存
- connect to 39 access Failedto connect access failed github github-fatal-unable-to-access-htt ps-github-com-failed-to-connect-t connect to 39 access ps-github-com-failed-to-connect-t githubusercontent connect failed to connect github to failed github-fatal-unable-to-access-htt err_proxy_connection_failed 39 password access denied connecting upstream failed route