Github unable to access github ssl connect error

Describes the cause and action for error messages.

Error Message(English)：
unable to access github ssl connect error

Resolution

症状
https://mseeeen.msen.jp/git-ssl-or-nss-connect-error-in-centos-6/#i

試行錯誤
https://mseeeen.msen.jp/git-ssl-or-nss-connect-error-in-centos-6/#i-2

curl を更新
https://mseeeen.msen.jp/git-ssl-or-nss-connect-error-in-centos-6/#4_curl

突然GitHubとhttps通信できなくなったときの解決メモ - Qiita
https://qiita.com/murai-taisuke/items/173b3cbbd697e630047d

GitHub からの clone でエラーが出たので対処した - Qiita
https://qiita.com/bass_ikeda/items/e52aec2d6a4eac8397da

Github unable to access SSL connect error - Stack Overflow
https://stackoverflow.com/questions/48938385/github-unable-to-access-ssl-connect-error/48939640

github からの git clone で SSL 関連のエラーが発生した場合の対処 - talk ...
http://www.hazama.nu/t2o2/archives/002932.shtml

HTTPS cloning errors - GitHub Help
https://help.github.com/en/articles/https-cloning-errors

Unable to access repository over HTTPS ・ Issue #3713 ... - GitHub
https://github.com/desktop/desktop/issues/3713