title: https connection not working on nginx (aws), only ip:port working
body: <p>New nginx user here. I am running a flask app with gunicorn on AWS account. The following config in <code>/etc/nginx/sites-enabled/flaskapp</code> works from my laptop at address <code>1x.xxx.xx.45:80</code></p>
  <pre><code>  server {
      listen 80;
      server_name 1x.xxx.xx.45;
  
      location / {
          proxy_pass http://127.0.0.1:8000;
      }
    }
  </code></pre>
  <p>but when I change to following settings by using public ipv4 DNS address, it only showed default page of nginx, not my app. (this issue is in second/after attempts; my first attempt with with same aws/inbound rules had worked fine with https url. I used same aws/security-group afterwards but no success)</p>
  <pre><code>  server {
      listen 443;
      server_name ec2-xx-xx-xx-45.ap-south-1.compute.amazonaws.com;
  
      location / {
          proxy_pass http://127.0.0.1:8000;
      }
    }
  
  </code></pre>
  <p>Afterwards I unlinked <code>/sites-available/default</code> as described in <a href="https://stackoverflow.com/questions/14460935/nginx-only-shows-welcome-page">this</a> and I don't see anything on that url. I tried other answers as well in that but no use. I am missing something obvious to others.</p>
  <p>Eventually I want to fire multiple apps on aws-ec2 and connect to them from outside via https for different tasks.</p>
  <hr />
  <p>Output for <code>nginx -T</code></p>
  <pre><code>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/nginx.pid;
  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 128;
      # 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:
  #   # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
  # 
  #   # auth_http localhost/auth.php;
  #   # pop3_capabilities &quot;TOP&quot; &quot;USER&quot;;
  #   # imap_capabilities &quot;IMAP4rev1&quot; &quot;UIDPLUS&quot;;
  # 
  #   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/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/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/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/vnd.apple.mpegurl         m3u8;
      application/vnd.ms-excel              xls;
      application/vnd.ms-fontobject         eot;
      application/vnd.ms-powerpoint         ppt;
      application/vnd.wap.wmlc              wmlc;
      application/vnd.google-earth.kml+xml  kml;
      application/vnd.google-earth.kmz      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/sites-enabled/flaskapp:
    server {
      listen 443;
      server_name ec2-xx-xx-xx-45.ap-south-1.compute.amazonaws.com;
  
      location / {
          proxy_pass http://127.0.0.1:8000;
      }
    }
  </code></pre>
  <p>And <code>ls /etc/nginx/sites-available/</code> is <code>default</code> and <code>ls /etc/nginx/sites-enabled/</code> is <code>flaskapp</code></p>