My let's encrypt cerficate refused to renew using certbot

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My domain

I ran this command: certbot renew

It produced this output: All renewal attempts failed. The following certs could not be renewed:
/etc/letsencrypt/live/ (failure)

My web server is (include version): nginx

The operating system my web server runs on is (include version): ubuntu 20.04.4

My hosting provider, if applicable, is:

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

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

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

Please share more of the Certbot output, preferably everything or even better the entire letsencrypt.log file.


Saving debug log to /var/log/letsencrypt/letsencrypt.log

Processing /etc/letsencrypt/renewal/

Cert is due for renewal, auto-renewing...
Plugins selected: Authenticator nginx, Installer nginx
Renewing an existing certificate
Performing the following challenges:
http-01 challenge for
Waiting for verification...
Challenge failed for domain
http-01 challenge for
Cleaning up challenges
Attempting to renew cert ( from /etc/letsencrypt/renewal/ produced an unexpected error: Some challenges have failed.. Skipping.
All renewal attempts failed. The following certs could not be renewed:
/etc/letsencrypt/live/ (failure)

All renewal attempts failed. The following certs could not be renewed:
/etc/letsencrypt/live/ (failure)

1 renew failure(s), 0 parse failure(s)


This shows the Let's Encrypt server doing the http challenge on IPv6. When you have an AAAA record in your DNS it uses that instead of any A record. Your DNS looks like this but the IPv4 and IPv6 address return different results. This often means the AAAA record is wrong. It could also mean your nginx config is not configured for IPv6 listen properly. In either case, they should be returning the same result.

Address: 2a03:b0c0:1:d0::1172:1001

curl -I4
(uses IPv4)
HTTP/1.1 301 Moved Permanently
Server: nginx/1.18.0 (Ubuntu)
Date: Wed, 22 Jun 2022 16:51:18 GMT
Content-Type: text/html
Content-Length: 178
Connection: keep-alive

curl -I6
(uses IPv6)
HTTP/1.1 200 OK
Server: nginx/1.18.0 (Ubuntu)
Date: Wed, 22 Jun 2022 16:51:23 GMT
Content-Type: text/html
Content-Length: 612
Last-Modified: Sat, 12 Mar 2022 11:27:58 GMT
Connection: keep-alive
ETag: "622c83be-264"
Accept-Ranges: bytes

i belive my nginx is well configured but do you have any solution to fix this

First, make sure your server IP's match your DNS. Run these commands on your server and check against the values I showed for DNS above (or your own DNS lookup):

curl -4
curl -6

If they do match, then please show the result of this and we'll take a look

sudo nginx -T

When I use IPv4 to your "home" page I see a page with data saying fibblebox. When I use IPv6 I only see a default IPv6 page. Something is wrong


The curl -4 and curl -6 the returned the same address to the one you sent above...

but the sudo nginx -T returned
IPv4 address for eth0:
IPv4 address for eth0:
IPv6 address for eth0: 2a03:b0c0:1:d0::1172:1001
IPv4 address for eth1:
it returned these addresses

that command should output your active nginx config. Can you paste that here? Please put three backticks before and after so it formats nice. Like this:

output of command


the output is much

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
# configuration file /etc/nginx/nginx.conf:
user www-data;
worker_processes auto;
pid /run/;
include /etc/nginx/modules-enabled/*.conf;

events {
	worker_connections 768;
	# multi_accept on;

http {

	# Basic Settings

	sendfile on;
	tcp_nopush on;
	tcp_nodelay on;
	keepalive_timeout 65;
	types_hash_max_size 2048;
	# server_tokens off;

	# server_names_hash_bucket_size 64;
	# server_name_in_redirect off;

	include /etc/nginx/mime.types;
	default_type application/octet-stream;

	# SSL Settings

	ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE
	ssl_prefer_server_ciphers on;

	# Logging Settings

	access_log /var/log/nginx/access.log;
	error_log /var/log/nginx/error.log;

	# Gzip Settings

	gzip on;

	# gzip_vary on;
	# gzip_proxied any;
	# gzip_comp_level 6;
	# gzip_buffers 16 8k;
	# gzip_http_version 1.1;
	# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

	# Virtual Host Configs

	include /etc/nginx/conf.d/*.conf;
	include /etc/nginx/sites-enabled/*;

#mail {
#	# See sample authentication script at:
#	#
#	# auth_http localhost/auth.php;
#	# pop3_capabilities "TOP" "USER";
#	# imap_capabilities "IMAP4rev1" "UIDPLUS";
#	server {
#		listen     localhost:110;
#		protocol   pop3;
#		proxy      on;
#	}
#	server {
#		listen     localhost:143;
#		protocol   imap;
#		proxy      on;
#	}

# configuration file /etc/nginx/modules-enabled/50-mod-http-image-filter.conf:
load_module modules/;

# configuration file /etc/nginx/modules-enabled/50-mod-http-xslt-filter.conf:
load_module modules/;

# configuration file /etc/nginx/modules-enabled/50-mod-mail.conf:
load_module modules/;

# configuration file /etc/nginx/modules-enabled/50-mod-stream.conf:
load_module modules/;

# configuration file /etc/nginx/mime.types:

types {
    text/html                             html htm shtml;
    text/css                              css;
    text/xml                              xml;
    image/gif                             gif;
    image/jpeg                            jpeg jpg;
    application/javascript                js;
    application/atom+xml                  atom;
    application/rss+xml                   rss;

    text/mathml                           mml;
    text/plain                            txt;
    text/      jad;
    text/vnd.wap.wml                      wml;
    text/x-component                      htc;

    image/png                             png;
    image/tiff                            tif tiff;
    image/vnd.wap.wbmp                    wbmp;
    image/x-icon                          ico;
    image/x-jng                           jng;
    image/x-ms-bmp                        bmp;
    image/svg+xml                         svg svgz;
    image/webp                            webp;

    application/font-woff                 woff;
    application/java-archive              jar war ear;
    application/json                      json;
    application/mac-binhex40              hqx;
    application/msword                    doc;
    application/pdf                       pdf;
    application/postscript                ps eps ai;
    application/rtf                       rtf;
    application/         m3u8;
    application/              xls;
    application/         eot;
    application/         ppt;
    application/vnd.wap.wmlc              wmlc;
    application/  kml;
    application/      kmz;
    application/x-7z-compressed           7z;
    application/x-cocoa                   cco;
    application/x-java-archive-diff       jardiff;
    application/x-java-jnlp-file          jnlp;
    application/x-makeself                run;
    application/x-perl                    pl pm;
    application/x-pilot                   prc pdb;
    application/x-rar-compressed          rar;
    application/x-redhat-package-manager  rpm;
    application/x-sea                     sea;
    application/x-shockwave-flash         swf;
    application/x-stuffit                 sit;
    application/x-tcl                     tcl tk;
    application/x-x509-ca-cert            der pem crt;
    application/x-xpinstall               xpi;
    application/xhtml+xml                 xhtml;
    application/xspf+xml                  xspf;
    application/zip                       zip;

    application/octet-stream              bin exe dll;
    application/octet-stream              deb;
    application/octet-stream              dmg;
    application/octet-stream              iso img;
    application/octet-stream              msi msp msm;

    application/vnd.openxmlformats-officedocument.wordprocessingml.document    docx;
    application/vnd.openxmlformats-officedocument.spreadsheetml.sheet          xlsx;
    application/vnd.openxmlformats-officedocument.presentationml.presentation  pptx;

    audio/midi                            mid midi kar;
    audio/mpeg                            mp3;
    audio/ogg                             ogg;
    audio/x-m4a                           m4a;
    audio/x-realaudio                     ra;

    video/3gpp                            3gpp 3gp;
    video/mp2t                            ts;
    video/mp4                             mp4;
    video/mpeg                            mpeg mpg;
    video/quicktime                       mov;
    video/webm                            webm;
    video/x-flv                           flv;
    video/x-m4v                           m4v;
    video/x-mng                           mng;
    video/x-ms-asf                        asx asf;
    video/x-ms-wmv                        wmv;
    video/x-msvideo                       avi;

# configuration file /etc/nginx/conf.d/redirect.conf:
server {
    return 301 $scheme://$request_uri;

# configuration file /etc/nginx/sites-enabled/default:
# You should look at the following URL's in order to grasp a solid understanding
# of Nginx configuration files in order to fully unleash the power of Nginx.
# In most cases, administrators will remove this file from sites-enabled/ and
# leave it as reference inside of sites-available where it will continue to be
# updated by the nginx packaging team.
# This file will automatically load configuration files provided by other
# applications, such as Drupal or Wordpress. These applications will be made
# available underneath a path with that package name, such as /drupal8.
# Please see /usr/share/doc/nginx-doc/examples/ for more detailed examples.

# Default server configuration
server {
	listen 80 default_server;
	listen [::]:80 default_server;

	# SSL configuration
	# listen 443 ssl default_server;
	# listen [::]:443 ssl default_server;
	# Note: You should disable gzip for SSL traffic.
	# See:
	# Read up on ssl_ciphers to ensure a secure configuration.
	# See:
	# Self signed certs generated by the ssl-cert package
	# Don't use them in a production server!
	# include snippets/snakeoil.conf;

	root /var/www/html;

	# Add index.php to the list if you are using PHP
	index index.html index.htm index.nginx-debian.html;

	server_name _;

	location / {
		# First attempt to serve request as file, then
		# as directory, then fall back to displaying a 404.
		try_files $uri $uri/ =404;

	# pass PHP scripts to FastCGI server
	#location ~ \.php$ {
	#	include snippets/fastcgi-php.conf;
	#	# With php-fpm (or other unix sockets):
	#	fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
	#	# With php-cgi (or other tcp sockets):
	#	fastcgi_pass;

	# deny access to .htaccess files, if Apache's document root
	# concurs with nginx's one
	#location ~ /\.ht {
	#	deny all;

# Virtual Host configuration for
# You can move that to a different file under sites-available/ and symlink that
# to sites-enabled/ to enable it.
#server {
#	listen 80;
#	listen [::]:80;
#	server_name;
#	root /var/www/;
#	index index.html;
#	location / {
#		try_files $uri $uri/ =404;
#	}

# configuration file /etc/nginx/sites-enabled/fibblebox:
server {

    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /home/winter/fibblebox;
    location /media/ {
       root /home/winter/fibblebox;
    location / {
        include proxy_params;
        proxy_pass http://unix:/home/winter/fibblebox.sock;

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

server {
    if ($host = {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    listen  80;
    return 404; # managed by Certbot


# configuration file /etc/nginx/proxy_params:
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;

# configuration file /etc/letsencrypt/options-ssl-nginx.conf:
# This file contains important security parameters. If you modify this file
# manually, Certbot will be unable to automatically provide future security
# updates. Instead, Certbot will print and log an error message with a path to
# the up-to-date file that you will need to refer to when manually updating
# this file. Contents are based on

ssl_session_cache shared:le_nginx_SSL:10m;
ssl_session_timeout 1440m;
ssl_session_tickets off;

ssl_protocols TLSv1.2 TLSv1.3;
ssl_prefer_server_ciphers off;


Yes, it often is long. Can you update your post to use 3 backtick characters? It looks like you used 3 single quote chars. On US Keyboards it is just to the left of the number 1 key but I don't know about other keyboards.

Nevermind. I see you did that while I was writing. I will look at it now.


Great. Thanks.

Only your nginx default server block listens for IPv6. Because of this any request coming in on IPv6 goes to that default server and not your fibblebox server blocks.

You need to add IPv6 listen options on each of your servers. There are various ways to specify listen but you could do it like this (the first is IPv4, second is IPv6)
Port 80:

	listen 80;
	listen [::]:80;

Port 443 is:

	listen 443 ssl;
	listen [::]:443 ssl;

You need to add the 2 listen lines for port 80 in this server block:

# configuration file /etc/nginx/conf.d/redirect.conf:
server {
    return 301 $scheme://$request_uri;

And, there are two server blocks in /etc/nginx/sites-enabled/fibblebox
Each has an IPv4 listen (one for 443 and one for 80) so add the IPv6 listen after the existing listen lines.

Ok, I think that's it :slight_smile:


YES it has renewed thanks alot... you solved my 2 days stress in few replies.. i look up to (thank you)