Salesforceは、アウトバウンドメッセージや Apex コールアウトなどの SSL 通信で、信頼できるルート証明機関(CA)によって署名された証明書のみを信頼します。自己署名証明書は使用できません。
openssl s_client -showcerts -connect <host>:<port>
000385468

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