nginx guacamole reverse proxy let'sencrypt. Original: https://www.reddit.com/r/homelab/comments/5m1fng/finally_got_nginx_reverse_proxy_working_with_lets/

guacamole.conf

server  {
  listen 443 ssl;
  server_name  sub.domain.com;
  ssl on;
  ssl_certificate /etc/letsencrypt/live/sub.domain.com/fullchain.pem;
  ssl_certificate_key  /etc/letsencrypt/live/sub.domain.com/privkey.pem;
  location  / {
    proxy_buffering  off;
    proxy_pass  http://[IPADDRESS]:[PORT]/guacamole/;
    proxy_http_version  1.1;
    proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header  Upgrade $http_upgrade;
    proxy_set_header  Connection $http_connection;
    access_log  off;
  }
  location /.well-known/ {
    allow all;
    root /var/www/html;
  }
}

nginx.conf

user  nginx;
worker_processes  2;   # Set to number of CPU cores

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

pid  /run/nginx.pid;

events {
    worker_connections  1024;
}

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

  log_format  main '$remote_addr - $remote_user [$time_local] "$request" '
              '$status $body_bytes_sent "$http_referer" '
              '"$http_user_agent" "$http_x_forwarded_for"';

  access_log  /var/log/nginx/access.log  main;
 
  root /var/www/html;

  sendfile  on;

  keepalive_timeout  65;

  include /etc/nginx/conf.d/*.conf;

  index  index.html index.htm;
}