# Certbot failed to authenticate some domains (authenticator: nginx) **URL:** \ **Category:** Help\ **Created:** [January 14, 2024, 9:06am UTC](https://community.letsencrypt.org/t/certbot-failed-to-authenticate-some-domains-authenticator-nginx/211696 "2024-01-14T09:06:47Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![yowamushisama](https://sea3.discourse-cdn.com/letsencrypt/user_avatar/community.letsencrypt.org/yowamushisama/32/77047_2.png) [@yowamushisama](https://community.letsencrypt.org/u/yowamushisama)\ **Post date:** [January 14, 2024, 9:06am UTC](https://community.letsencrypt.org/t/certbot-failed-to-authenticate-some-domains-authenticator-nginx/211696/1 "2024-01-14T09:06:47Z")
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. [crt.sh | example.com](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: > **[React App](https://lecturalink.com)** > > Web site created using create-react-app I ran this command: sudo certbot --nginx -d [lecturalink.com](http://lecturalink.com) -d [www.lecturalink.com](http://www.lecturalink.com) It produced this output: Saving debug log to /var/log/letsencrypt/letsencrypt.log Requesting a certificate for [lecturalink.com](http://lecturalink.com) and [www.lecturalink.com](http://www.lecturalink.com) Certbot failed to authenticate some domains (authenticator: nginx). The Certificate Authority reported these problems: Domain: [lecturalink.com](http://lecturalink.com) Type: unauthorized Detail: 2a02:4780:b:838:0:334f:2a4b:3: Invalid response from [http://lecturalink.com/.well-known/acme-challenge/jtLwgoFSs4n2bxNwiY3My5DiJ\_zUOmtHWJsu7oIOOLc:](http://lecturalink.com/.well-known/acme-challenge/jtLwgoFSs4n2bxNwiY3My5DiJ_zUOmtHWJsu7oIOOLc:) 404 Hint: The Certificate Authority failed to verify the temporary nginx configuration changes made by Certbot. Ensure the listed domains point to this nginx server and that it is accessible from the internet. Some challenges have failed. Ask for help or search for solutions at [https://community.letsencrypt.org](https://community.letsencrypt.org). See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details. My web server is (include version): nginx/1.21.4 The operating system my web server runs on is (include version): Ubuntu 22.04 64bit My hosting provider, if applicable, is:Hostinger 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,I am using command line vps hosting The version of my client is (e.g. output of `certbot --version` or `certbot-auto --version` if you're using Certbot): 1.21.0 ---
**Author:** ![MikeMcQ](https://sea3.discourse-cdn.com/letsencrypt/user_avatar/community.letsencrypt.org/mikemcq/32/52772_2.png) [@MikeMcQ](https://community.letsencrypt.org/u/MikeMcQ)\ **Post date:** [January 14, 2024, 9:50am UTC](https://community.letsencrypt.org/t/certbot-failed-to-authenticate-some-domains-authenticator-nginx/211696/2 "2024-01-14T09:50:07Z")
> [@yowamushisama](#): > > Detail: 2a02:4780:b:838:0:334f:2a4b:3: Invalid response from [http://lecturalink.com/.well-known/acme-challenge/jtLwgoFSs4n2bxNwiY3My5DiJ\_zUOmtHWJsu7oIOOLc:](http://lecturalink.com/.well-known/acme-challenge/jtLwgoFSs4n2bxNwiY3My5DiJ_zUOmtHWJsu7oIOOLc:) 404 Your DNS AAAA record for IPv6 is not set to the right address. You should correct that. If you won't have IPV 6 support then you need to remove that AAAA record. > **[Test result for lecturalink.com: Warning](https://letsdebug.net/lecturalink.com/1769523?debug=y)** > > 1 unique issue(s) detected (MultipleIPAddressDiscrepancy) ---
**Author:** ![rg305](https://sea3.discourse-cdn.com/letsencrypt/user_avatar/community.letsencrypt.org/rg305/32/91314_2.png) [@rg305](https://community.letsencrypt.org/u/rg305)\ **Post date:** [January 14, 2024, 12:02pm UTC](https://community.letsencrypt.org/t/certbot-failed-to-authenticate-some-domains-authenticator-nginx/211696/3 "2024-01-14T12:02:34Z")
> [@yowamushisama](#): > > The operating system my web server runs on is (include version): > Ubuntu 22.04 64bit > [@yowamushisama](#): > > Certbot): > 1.21.0 Please follow the recommended installation for `certbot` on `Ubuntu` [with `nginx`]: [Certbot Instructions | Certbot (eff.org)](https://certbot.eff.org/instructions?ws=nginx&os=ubuntufocal) [installation instructions for `Ubuntu 20` will also work for `Ubuntu 22`] ---
**Author:** ![system](https://global.discourse-cdn.com/letsencrypt/original/3X/c/a/ca6c06ea1ea201324bba7048c6841ce60236468d.png) [@system](https://community.letsencrypt.org/u/system)\ **Post date:** [February 13, 2024, 12:03pm UTC](https://community.letsencrypt.org/t/certbot-failed-to-authenticate-some-domains-authenticator-nginx/211696/4 "2024-02-13T12:03:15Z")
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