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Client with the currently selected authenticator does not support any combination of challenges that will satisfy the CA.

Last updated at Posted at 2019-04-26

概要

Nginx/debian9で立てていたwebサーバーの証明書を更新しようとしたところ発生したエラーについて。

エラー

$ certbot renew 
...省略...
Client with the currently selected authenticator does not support any combination of challenges that will satisfy the CA.

解決策

$ certbot --authenticator standalone --installer nginx -d yourdomain.com --pre-hook "systemctl stop nginx" --post-hook "systemctl start nginx"

また、この時ブラウザで確認した際にERR_TOO_MANY_REDIRECTSと言ったエラーが発生した場合、certbotが改変したnginxのconfigファイルが既存の設定と衝突している場合があるので、確認する。

参考

certbot公式より
https://certbot.eff.org/lets-encrypt/debianstretch-nginx

SSL web server 診断サイト
https://www.ssllabs.com/ssltest/analyze.html

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