Jellyfin Fail2Ban Setup Guide (2026): Block Brute-Force Login Attacks Automatically

Jellyfin Fail2Ban Setup Guide (2026)

If your Jellyfin server is accessible from the internet, it will receive brute-force login attempts. Fail2Ban automatically bans IP addresses after repeated failed logins.

How Fail2Ban Works

1. Fail2Ban monitors Jellyfin log files
2. It detects patterns matching failed login attempts
3. After X failures from the same IP, it bans that IP via firewall rules
4. The ban expires after a configurable duration

Step 1: Install Fail2Ban

sudo apt install fail2ban -y
sudo systemctl enable --now fail2ban

Step 2: Create the Jellyfin Filter

Create /etc/fail2ban/filter.d/jellyfin.conf:

[Definition]
failregex = ^.*Authentication request for .* has been denied \(IP: "<ADDR>"\).*$
ignoreregex =

This regex matches Jellyfin authentication failure log entries.

Step 3: Create the Jellyfin Jail

Create /etc/fail2ban/jail.d/jellyfin.local:

[jellyfin]
enabled = true
filter = jellyfin
port = http,https,8096
logpath = /path/to/jellyfin/config/log/log_*.log
maxretry = 5
bantime = 3600
findtime = 600

For Docker installations

logpath = /home/user/jellyfin/config/log/log_*.log

Step 4: Restart and Test

sudo systemctl restart fail2ban
sudo fail2ban-client status jellyfin

Test by deliberately failing 5 logins from another device.

Unban a test IP:

sudo fail2ban-client set jellyfin unbanip X.X.X.X

Step 5: Whitelist Your Own IPs

# In /etc/fail2ban/jail.d/jellyfin.local
ignoreip = 127.0.0.1/8 192.168.1.0/24 YOUR_VPN_IP

Advanced: Cloudflare Ban Action

If you use Cloudflare Tunnel or proxy, banning the IP via iptables blocks Cloudflare IP - not the attacker. Use the Cloudflare API to ban at the edge.

Create /etc/fail2ban/action.d/cloudflare.conf:

[Definition]
actionban = curl -s -X POST "https://api.cloudflare.com/client/v4/user/firewall/access_rules/rules" \
  -H "Authorization: Bearer <cftoken>" \
  -H "Content-Type: application/json" \
  --data "{"mode":"block","configuration":{"target":"ip","value":"<ip>"},"notes":"Fail2Ban Jellyfin"}"

[Init]
cftoken = YOUR_CLOUDFLARE_API_TOKEN

Advanced: Permanent Ban for Repeat Offenders

[jellyfin-repeat]
enabled = true
filter = jellyfin
logpath = /var/log/fail2ban.log
maxretry = 3
bantime = -1
findtime = 86400

Monitoring Bans

sudo fail2ban-client status jellyfin
sudo fail2ban-client banned
sudo tail -f /var/log/fail2ban.log

FAQ

Does Fail2Ban work with Docker? Yes, as long as the Jellyfin log files are accessible from the host filesystem.

Will Fail2Ban block legitimate users who forget their password? Yes, after 5 failures. Set maxretry higher (e.g., 10) if this is a concern. Whitelist your home IP range.

Fail2Ban protecting your server? Monitor login attempts from your phone. Download JellyWatch on Google Play - failed login alerts and session monitoring for Jellyfin.