My domain is: mateon_sl.mateon.eu I ran this command: sudo certbot --apache My web server is (include version): apache2 The operating system my web server runs on is (include version): ubuntu20.04 I can login to a root shell on my machine (yes or no, or I don't know): yes I'm using a control pa…

Hi... So, i figured out that domains cant have "_". So i changed mateon_sl.mateon.eu to mateon-sl.mateon.eu. And now it works fine! Thanks so much, Jetam

Hello @jetamgamer , welcome to the Let's Encrypt community. :slightly_smiling_face: Let's Debug show [image] jetamgamer: mateon_sl.mateon.eu InvalidDomain Fatal https://letsdebug.net/mateon_sl.mateon.eu/1374036#InvalidDomain-Fatal Typo?

Please see Domain name contains invalid character - #9 by Bruce5051

[image] Bruce5051: Typo? Actually I guess not, but the domain name is not valid; DNS GIGO $ nslookup mateon_sl.mateon.eu dns1.registrar-servers.com. Server: dns1.registrar-servers.com. Address: 156.154.132.200#53 mateon_sl.mateon.eu canonical name = mateon.eu. Name: mat…

@jetamgamer , Have a pleasant day! :slight_smile:

[image] jetamgamer: So, i figured out that domains cant have "_". So i changed mateon_sl.mateon.eu to mateon-sl.mateon.eu. And now it works fine! Perhaps other (free) CAs do allow "_" in the FQDN. [the Internet won't allow "_" in the domain name - but this use is further left of that] Seem…

The underscore in domain name and cert is not intuitive for sure. I found this old thread which covers the topic really well. Comments from LE staff as well as ex-Certbot devs [image] Underscore in subdomain fails Help T…

[image] rg305: Perhaps other (free) CAs do allow "_" in the FQDN. Nope. [image] rg305: [the Internet won't allow "_" in the domain name - but this use is further left of that] Seems contradictory for ACME to require TXT record like: "acme-challenge.{domain}" But not to allow the name …

[image] petercooperjr: so that they're guaranteed not to conflict with an actual host's name. But yet they can have IP Addresses :laughing: [image] DNS-01 Challenge including more DNS Records than TXT Issuance Tech F…

Sure, you can have an A/AAAA record in DNS that has an underscore in it. It's just not a valid hostname so you can't use it for a URL, but there are other uses that people have pressed DNS into.

[image] petercooperjr: but there are other uses that people have pressed DNS into. Yes; very true! :slight_smile:

Certbot not showing all the domains

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Bruce5051 February 14, 2023, 8:46pm 10

But yet they can have IP Addresses

Topic		Replies	Views
Underscore in subdomain fails Help	5	10783	April 6, 2017
Underscore ("_") as a valid domain name? Server	5	18325	April 21, 2017
Unable to generate certificate : Invalid characters Help	4	1197	June 28, 2022
Problem while adding a subdomain to a certificate Help	3	654	March 15, 2021
Invalid character in DNS name Help	19	28592	March 23, 2018

Certbot not showing all the domains

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