我尝试在AWS EC2服务器上续订SSL证书，但出现以下错误，因此经过大量研究，我无法找到解决方案。
我运行的命令：

$ sudo certbot renew --dry-run

错误：

Saving debug log to /var/log/letsencrypt/letsencrypt.log

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Processing /etc/letsencrypt/renewal/mydomain.com.conf
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Cert is due for renewal, auto-renewing...
Plugins selected: Authenticator nginx, Installer nginx
Renewing an existing certificate
Performing the following challenges:
http-01 challenge for mydomain.com
Using default addresses 80 and [::]:80 ipv6only=on for authentication.
Waiting for verification...
Challenge failed for domain mydomain.com
http-01 challenge for mydomain.com
Cleaning up challenges
Attempting to renew cert (mydomain.com) from /etc/letsencrypt/renewal/prod-mydomain.conf produced an unexpected error: Some challenges have failed.. Skipping.
All renewal attempts failed. The following certs could not be renewed:
  /etc/letsencrypt/live/mydomain.com/fullchain.pem (failure)

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All renewal attempts failed. The following certs could not be renewed:
  /etc/letsencrypt/live/mydomain.com/fullchain.pem (failure)
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1 renew failure(s), 0 parse failure(s)

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

   Domain: mydmain.com
   Type:   unauthorized
   Detail: 2.211.168.8: Invalid response from
   http://mydoamin.com/.well-known/acme-challenge/ov6EBHInETwkZZ-oqLNI908jFXvN7PFK86ZCJYcdrtA:
   404

   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.