安装 SSL 证书（Let’s Encrypt）
键入./certbot-auto certonly --standalone --email 2897xxx@qq.com -d www.example.com -d example.com后，
出现DNS problem: SERVFAIL looking up A/ CAA for xxx.com
网上搜了好多，一直无法解决问题，
跪求大神帮助，涕泪感激！
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[root@li1437-223 letsencrypt]# ./certbot-auto certonly --standalone --email 13641418507@163.com -d www.xxxx.com -d xxxx.com
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator standalone, Installer None
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for www.xx.com
http-01 challenge for xx.com
Waiting for verification...
Cleaning up challenges
Failed authorization procedure. www.xx.com (http-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: DNS problem: SERVFAIL looking up CAA for xx.com, xxcom (http-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: DNS problem: SERVFAIL looking up A for xxx.com
IMPORTANT NOTES:
- The following errors were reported by the server:
Domain: www.zxx.com
Type: connection
Detail: DNS problem: SERVFAIL looking up CAA for xxcom
Domain: xx.com
Type: connection
Detail: DNS problem: SERVFAIL looking up A for xxxx. com
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. Additionally, please check that
your computer has a publicly routable IP address and that no
firewalls are preventing the server from communicating with the
client. If you're using the webroot plugin, you should also verify
that you are serving files from the webroot path you provided.
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