DNS problem: SERVFAIL looking up CAA for www.188589.com


Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: 188589.com 656685.com www.188589.com www.656685.com

I ran this command: certbot certonly --break-my-certs --force-renewal --agree-tos --manual-public-ip-logging-ok --no-eff-email
–manual --preferred-challenges http -m "xxxxxx@gmail.com"
-d “188589.com 656685.com www.188589.com www.656685.com
–manual-auth-hook “$Folder/SSL_auth_http.sh” --manual-cleanup-hook “$Folder/SSL_clean_http.sh”

It produced this output: Get SSL cert for 188589.com, 656685.com, www.188589.com, www.656685.com
New SSL cert will be in /opt/deployment/SSL_Renew/sslcert/188589.com-20180919_0922
Saving debug log to /opt/deployment/SSL_Renew/logs/letsencrypt.log
Plugins selected: Authenticator manual, Installer None
Starting new HTTPS connection (1): acme-v02.api.letsencrypt.org
Obtaining a new certificate
Performing the following challenges:

Waiting for verification…
Cleaning up challenges

An unexpected error occurred:
Error finalizing order :: Rechecking CAA: While processing CAA for www.188589.com: DNS problem: SERVFAIL looking up CAA for www.188589.com
Please see the logfiles in /opt/deployment/SSL_Renew/logs for more details.

My web server is (include version): tengine-2.2.2

The operating system my web server runs on is (include version):

My hosting provider, if applicable, is: aliyun.com

I can login to a root shell on my machine (yes or no, or I don’t know): yes

I’m using a control panel to manage my site (no, or provide the name and version of the control panel): no


All setting are same and there are no CAA record on those 4 Domains.
Why only www.188589.com got CAA issue?


Hi @glorysky222

the first nameserver has a timeout:

nslookup www.188589.com.
DNS request timed out.
timeout was 2 seconds.
Name: bg99.08cdn.com
Aliases: www.188589.com

One timeout -> complete fail. I don’t know why there is no second try.


Seem that it got correct addresses finally.


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