Where do I write/create DNS text record?

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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: app.oliveuion.com

I ran this command: sudo certbot certonly -d admin.oliveunion.com --manual --preferred-challenges dns-01 --force-renewal --manual-public-ip-logging-ok

It produced this output:
Performing the following challenges:
dns-01 challenge for admin.oliveunion.com

Please deploy a DNS TXT record under the name
_acme-challenge.admin.oliveunion.com with the following value:

KqfBHR7gyWgyTjcb_O3GBiajOJDdvRQevcnOVsaC8i4

Before continuing, verify the record is deployed.

Press Enter to ContinueWaiting for verification…
Cleaning up challenges
Failed authorization procedure. admin.oliveunion.com (dns-01): urn:acme:error:dns :: DNS problem: NXDOMAIN looking up TXT for _acme-challenge.admin.oliveunion.com

IMPORTANT NOTES:

  • The following errors were reported by the server:

    Domain: admin.oliveunion.com
    Type: None
    Detail: DNS problem: NXDOMAIN looking up TXT for
    _acme-challenge.admin.oliveunion.com

My web server is (include version): Nginx

The operating system my web server runs on is (include version): Ubuntu 16.04

My hosting provider, if applicable, is: cafe24

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

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):certbot 0.23.0

I have no idea where to create this DNS text record. Do I write on the webserver? Cafe24? I’m extremely lost with this one.

2

In your DNS zone file editor.

Nope, webservers don't have anything to do with DNS settings. (Most of the time.)

It seems your domains DNS is hosted by Cafe24, so I guess this is correct! Look for the DNS settings in their control panel, specifically something called a zone file and/or zone file editor. Or sometimes it's just called DNS editor or something like that.

Another question for you: why are you using the DNS challenge? Is port 80 blocked?

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Thank you for responding. I was able to solve my issue by following the directions found here: https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-16-04.

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