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Since authentik uses WebSockets to communicate with Outposts, it does not support HTTP/1.0 reverse-proxies. The HTTP/1.0 specification does not officially support WebSockets or protocol upgrades, though some clients may allow it.

If you want to access authentik behind a reverse proxy, there are a few headers that must be passed upstream:

  • X-Forwarded-Proto: Tells authentik and Proxy Providers if they are being served over an HTTPS connection.
  • X-Forwarded-For: Without this, authentik will not know the IP addresses of clients.
  • Host: Required for various security checks, WebSocket handshake, and Outpost and Proxy Provider communication.
  • Connection: Upgrade and Upgrade: WebSocket: Required to upgrade protocols for requests to the WebSocket endpoints under HTTP/1.1.

It is also recommended to use a modern TLS configuration and disable SSL/TLS protocols older than TLS 1.3.

The following nginx configuration can be used as a starting point for your own configuration.

# Upstream where your authentik server is hosted.
upstream authentik {
server <hostname of your authentik server>:9443;
# Improve performance by keeping some connections alive.
keepalive 10;

# Upgrade WebSocket if requested, otherwise use keepalive
map $http_upgrade $connection_upgrade_keepalive {
default upgrade;
'' '';

server {
# HTTP server config
listen 80;
listen [::]:80;
server_name sso.domain.tld;
# 301 redirect to HTTPS
return 301 https://$host$request_uri;
server {
# HTTPS server config
listen 443 ssl http2;
listen [::]:443 ssl http2;
server_name sso.domain.tld;

# TLS certificates
ssl_certificate /etc/letsencrypt/live/domain.tld/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/domain.tld/privkey.pem;
add_header Strict-Transport-Security "max-age=63072000" always;

# Proxy site
location / {
proxy_pass https://authentik;
proxy_http_version 1.1;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade_keepalive;