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Authelia CONF

You will need to setup a domain/subdomain for your authentication. Setup your domain/subdomain in NGINX Proxy Manager as normal. Then add the following to the "Advanced" tab in the Proxy Host setup for the domain.

location / {
set $upstream_authelia; # This example assumes a Docker deployment. Change the IP and Port to your setup
proxy_pass $upstream_authelia;
client_body_buffer_size 128k;

#Timeout if the real server is dead
proxy_next_upstream error timeout invalid_header http_500 http_502 http_503;

# Advanced Proxy Config
send_timeout 5m;
proxy_read_timeout 360;
proxy_send_timeout 360;
proxy_connect_timeout 360;

# Basic Proxy Config
proxy_set_header Host $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;
proxy_set_header X-Forwarded-Host $http_host;
proxy_set_header X-Forwarded-Uri $request_uri;
proxy_set_header X-Forwarded-Ssl on;
proxy_redirect  http://  $scheme://;
proxy_http_version 1.1;
proxy_set_header Connection "";
proxy_cache_bypass $cookie_session;
proxy_no_cache $cookie_session;
proxy_buffers 64 256k;

# If behind reverse proxy, forwards the correct IP, assumes you're using Cloudflare. Adjust IP for your Docker network.
set_real_ip_from; #make sure this IP range matches your netowrk setup
real_ip_header CF-Connecting-IP;
real_ip_recursive on;