certbot，二次生成ssl證書時報錯：The following errors were reported by the server:ssl證書已經被佔用

錯誤：To fix these errors, please make sure that your domain name was    entered correctly and the DNS A/AAAA record(s) for that domain    contain(s) the right IP address.   這個是因爲你的域名已經解析過 _acme-challeng

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