How to Fix Authelia Session Error

In this tutorial, you'll learn about How to Fix Authelia Session Error. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

Authelia returns Session not found or Session expired immediately after login — the Redis-backed session store is disconnected or the session cookie is configured incorrectly.

The Problem

time="2026-06-24T10:00:00Z" level=error msg="Unable to retrieve session: redis: connection refused"

Step-by-Step Fix

Step 1: Check Redis connection

redis-cli -h localhost -p 6379 ping

Step 2: Configure Redis session provider

# /etc/authelia/configuration.yml
session:
  name: authelia_session
  domain: example.com
  same_site: lax
  secret: YOUR_SESSION_SECRET
  expiration: 3600
  inactivity: 300
  remember_me: 1y

  redis:
    host: localhost
    port: 6379
    password: ""
    database: 0
    minimum_idle_connections: 5

Step 3: Use Redis Sentinel

session:
  redis:
    host: redis-sentinel
    port: 26379
    sentinel_master: mysentinel
    password: ""
    database: 0

Step 4: Configure encryption key

session:
  secret: MUST_BE_32_CHARS_LONG_OR_MORE_!  # Used for encrypting session data

Step 5: Test session persistence

# Authenticate via Authelia
# Then verify session exists in Redis
redis-cli KEYS "authelia_session*"

Step 6: Set proper session timeouts

session:
  expiration: 86400   # 24 hours max session
  inactivity: 1800    # 30 minutes idle timeout
  remember_me: 2592000  # 30 days

Prevention Tips

• Use a strong session secret (32+ random characters)
• Configure Redis with authentication in production
• Monitor Redis Connection Pool usage
• Set realistic session timeouts for your use case

Common Mistakes with session error

1. Using return to exit a function early instead of wrapping a pure value in the monad
2. Mixing let bindings with <- bindings in do notation, producing type errors
3. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors

These mistakes appear frequently in real-world AUTHELIA code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ