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https://hanzama.x0.to/2020/08/25/from-september-1-the-ssl-tls-certificate-over-398-days-is-less-reliable-so-it-is-important-to-lose-reliability/
9月1日から、398日間を超えるSSL/TLS証明書は信頼性を失うため要注意(マイナビニュース)