Understanding DNS issue

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My domain is: www.ibigroup.com

I ran this command:

It produced this output:

Renewing an existing certificate
Performing the following challenges:
http-01 challenge for www.ibigroup.com
Waiting for verification...
Challenge failed for domain www.ibigroup.com
http-01 challenge for www.ibigroup.com
Cleaning up challenges
Some challenges have failed.


  • The following errors were reported by the server:

    Domain: www.ibigroup.com
    Type: dns
    Detail: DNS problem: SERVFAIL looking up CAA for www.ibigroup.com -
    the domain's nameservers may be malfunctioning

My web server is (include version): Apache

The operating system my web server runs on is (include version): Ubuntu 20.04.2

My hosting provider, if applicable, is: DigitalOcean

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

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): 0.40.0

To add. This cert has two names, with and without the www. I had some issues with this when it was first setup (which I can't recall but it was a struggle)

based on this error message I found previous threads and this seems (like the message says) a DNS issue. I note that when I use google dig for some things on this domain I do get some errors for some records.

My problem is that the client manages their own DNS and has done so poorly in the past. I am going to need to give them some specific direction I think as to what records are failing or what the "right" result in dig (google or otherwise) looks like. If I just tell them "your DNS is broken" we won't make any progress and the current cert expires next Friday.

Any insight here would be greatly appreciated.

1 Like

I think the client will need to reach out to their DNS host (Network Solutions) and tell them something like:


I host my domain on Network Solutions worldnic nameservers.

Something seems to be wrong with the DNSSEC in my zone.

Mostly, it works, unless I send a query for www.ibigroup.com for a record type other than A, in which case the DNSSEC response is invalid.

This can be reproduced by looking at https://dnsviz.net/d/www.ibigroup.com/dnssec/?rr=257&a=all&ds=all&ta=.&tk= or trying to query the same thing via, or any other DNSSEC-validating resolver.

If you really get desperate/run out of time, there is always the option to just disable DNSSEC on the domain, which should fix it.


Welcome to the Let's Encrypt Community :slightly_smiling_face:




Not good:





No wonder my tests kept changing...


1 Like

Thank you.

Just curious is this a known issue with these name servers or likely simply a misconfiguration?


So "My foot hurts"....
Cut it off, that might help.
Worldnic sucks.


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