用let's encrypt为邮件服务器申请证书，提示解析不了

root@mail:~# certbot --nginx --email xi.chong888@163.com -d mail.kingcooler-sz.com.cn
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator nginx, Installer nginx
Obtaining a new certificate
Performing the following challenges:
tls-sni-01 challenge for mail.kingcooler-sz.com.cn
Waiting for verification...
Cleaning up challenges
Failed authorization procedure. mail.kingcooler-sz.com.cn (tls-sni-01): urn:acme:error:unknownHost :: The server could not resolve a domain name :: No valid IP addresses found for mail.kingcooler-sz.com.cn

IMPORTANT NOTES:
- The following errors were reported by the server:

   Domain: mail.kingcooler-sz.com.cn
   Type:   unknownHost
   Detail: No valid IP addresses found for mail.kingcooler-sz.com.cn

   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.

在ssl开启之前，不要开启https的跳转，如果有cdn，先直接解析到源服务器！

----------------------------------------------------------------------------------------------------
菜鸟团队技术博客：点击联系