Ubuntu Nginx: HTTPS not accessible from internet or other machine on same LAN, even thought port 443 is open and listening

Nginx 1.22.0 Certbot 1.32.2

I can't access HTTPS or port 443 on my webpage from the internet or even another machine on my LAN, even though port 443 is open and listening on Ubuntu and I can even access the webpage at localhost. Port 80/HTTP works fine from anywhere. Nothing is wrong when I run "sudo service nginx status." Nothing else is using 443 when I use netstat. Any ideas?

The output of this command would be a good start to understanding why nginx isn't listening on HTTPS:

sudo nginx -T
4 Likes

Netstat says it's listening, but there's probably something I'm missing. Here's the output:

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

events {
        worker_connections 768;
        # multi_accept on;
}

http {

        ##
        # Basic Settings
        ##

        sendfile on;
        tcp_nopush on;
        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: POOD                                                                                                                                                                             LE
        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:
#       # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
#       # 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-geoip2.conf:
load_module modules/ngx_http_geoip2_module.so;

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

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

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

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

# configuration file /etc/nginx/modules-enabled/70-mod-stream-geoip2.conf:
load_module modules/ngx_stream_geoip2_module.so;

# 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/vnd.sun.j2me.app-descriptor      jad;
    text/vnd.wap.wml                      wml;
    text/x-component                      htc;

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

    font/woff                             woff;
    font/woff2                            woff2;

    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/vnd.apple.mpegurl         m3u8;
    application/vnd.google-earth.kml+xml  kml;
    application/vnd.google-earth.kmz      kmz;
    application/vnd.ms-excel              xls;
    application/vnd.ms-fontobject         eot;
    application/vnd.ms-powerpoint         ppt;
    application/vnd.oasis.opendocument.graphics        odg;
    application/vnd.oasis.opendocument.presentation    odp;
    application/vnd.oasis.opendocument.spreadsheet     ods;
    application/vnd.oasis.opendocument.text            odt;
    application/vnd.openxmlformats-officedocument.presentationml.presentation                                                                                                                                                                                 pptx;
    application/vnd.openxmlformats-officedocument.spreadsheetml.sheet    xlsx;
    application/vnd.openxmlformats-officedocument.wordprocessingml.document    d                                                                                                                                                                             ocx;
    application/vnd.wap.wmlc              wmlc;
    application/wasm                      wasm;
    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;

    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/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.
# https://www.nginx.com/resources/wiki/start/
# https://www.nginx.com/resources/wiki/start/topics/tutorials/config_pitfalls/
# https://wiki.debian.org/Nginx/DirectoryStructure
#
# 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 {

        # SSL configuration
        #
        #listen 443 ssl default_server;
        #listen [::]:443 ssl default_server;
        #
        # Note: You should disable gzip for SSL traffic.
        # See: https://bugs.debian.org/773332
        #
        # Read up on ssl_ciphers to ensure a secure configuration.
        # See: https://bugs.debian.org/765782
        #
        # 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 duckroll.epicgamer.org;

        location / {
                root   /var/www/html;
                index  index.html index.htm;
                ssi on;
                if ($request_uri ~ ^/(.*)\.html(\?|$)) {
                        return 302 /$1;
                }
                try_files $uri $uri.html $uri/ =404;
                location /autosaul {
                        alias /var/www/html/autosaul;
                        try_files $uri $uri/ @autosaul;
                }
}

location @autosaul {
                rewrite /autosaul/(.*)$ /autosaul/info.html?/$1 last;
}


        error_page  404              /404.html;
        location = /404.html {
            root   /var/www/html;
            internal;
        }

        error_page  403              /403.html;
        location = /403.html {
            root   /var/www/html;
            internal;
        }

        error_page  500 502 503 504  /50x.html;
        location = /50x.html {
            root   /var/www/html;
            internal;
        }



        # pass PHP scripts to FastCGI server
        #
        #location ~ \.php$ {
        #       include snippets/fastcgi-php.conf;
        #
        #       # With php-fpm (or other unix sockets):
        #       fastcgi_pass unix:/run/php/php7.4-fpm.sock;
        #       # With php-cgi (or other tcp sockets):
        #       fastcgi_pass 127.0.0.1:9000;
        #}

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

    listen 443 ssl; # managed by Certbot
    listen [::]:443 ssl;
    ssl_certificate /etc/letsencrypt/live/duckroll.epicgamer.org/fullchain.pem;                                                                                                                                                                              # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/duckroll.epicgamer.org/privkey.pem                                                                                                                                                                             ; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}


# Virtual Host configuration for example.com
#
# 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 example.com;
#
#       root /var/www/example.com;
#       index index.html;
#
#       location / {
#               try_files $uri $uri/ =404;
#       }
#}

server {
    if ($host = duckroll.epicgamer.org) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


        listen 80 default_server;
        listen [::]:80 default_server;

        server_name duckroll.epicgamer.org;
    return 404; # managed by Certbot


}

# 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 https://ssl-config.mozilla.org

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;

ssl_ciphers "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECD                                                                                                                                                                             SA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:E                                                                                                                                                                             CDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384";

# configuration file /etc/nginx/sites-enabled/duckroll:
server {
       listen 80;
       listen [::]:80;

       server_name example.ubuntu.com;

       root /var/www/duckroll/;
       index index.html;

       location / {
              autoindex on;
              autoindex_exact_size on;
              try_files $uri $uri/ =404;
       }
}

I guess it'd be a firewall: nftables?

3 Likes

Yeah, looks like a firewall issue to me.

If you run something locally like:

curl -I --resolve duckroll.epicgamer.org:443:127.0.0.1 https://duckroll.epicgamer.org

I bet it will work.

3 Likes

that didn't work, it returned curl: (49) Couldn't parse CURLOPT_RESOLVE entry 'duckroll.epicgamer.org:127.0.0.1:443' What is the command supposed to do?

Sorry, that was before I edited the command to fix a mistake. Try what it says now.

2 Likes

Thanks, it worked now

Server: nginx/1.22.0 (Ubuntu)
Date: Thu, 12 Jan 2023 02:30:25 GMT
Content-Type: text/html
Connection: keep-alive
1 Like

Right. So it means that nginx is listening on port 443, and you can access it locally.

So I'd look at:

  • Your router/modem to see whether a port forwarding rule has been set up for port 443 TCP.
  • ufw status
  • Whether Charter are blocking port 443 on your service.
3 Likes

I can't even access HTTPS from a machine on the same LAN, so I don't think it's a router issue, but there is a rule set up for 443.
UFW has a rule for Nginx HTTP and Nginx HTTPS both allowed, and Nginx is actively listening when running netstat.
If charter is something you install separately like from apt, then I haven't installed it. If it is built into Ubuntu, what can I do to check if it is blocking 443?

Via LAN IP or FQDN?

2 Likes

Mmm, sometimes routers suck at loopback NAT and fail to create the connection when you try to connect to the WAN IP address from inside the LAN.

I think one more thing worth checking is whether you can try the curl --resolve trick from another machine on your LAN, substituting 127.0.0.1 for the LAN IP address of your nginx server.

Edit: if you tried LAN IP already and it's not working, then it really seems that the blame is on a local firewall like ufw.

2 Likes

Lan IP

did it ever work?
If so, when did this problem start?

2 Likes

Sorry, I should have specified that I was accessing it from the Lan IP.

1 Like

Never worked. I'm trying to set up my website, but I ran into this roadblock and have been trying to fix it myself. I don't know too much about Nginx, so I wasn't able to on my own, so I came here.

OK.
Please show:
netstat -pant | grep 443 | grep -i listen

2 Likes

Maybe the full output of

sudo iptables-save

would help as well. To see whether ufw is colliding with some other rules that might be blocking port 443.

3 Likes
tcp        0      0 0.0.0.0:443             0.0.0.0:*               LISTEN      4767/nginx: master
tcp6       0      0 :::443                  :::*                    LISTEN      4767/nginx: master
1 Like

Curl was unable to connect from my Windows machine. I'll try this (on the Ubuntu machine)