By ThreatListPro Security Team · Published March 14, 2026 · Last verified: March 14, 2026
ThreatListPro is a curated VPN brute force blocklist ($9.99/month) that proactively blocks known attackers at the firewall before they ever reach your VPN portal. Fail2ban is a free, open-source intrusion prevention tool that monitors server log files and bans IPs after repeated failed login attempts. ThreatListPro is proactive — it blocks known attackers before they attempt to log in. Fail2ban is reactive — it only acts after attacks are already underway. This comparison helps network administrators understand which approach fits their security needs.
Both ThreatListPro and Fail2ban aim to stop brute force attacks, but they operate at fundamentally different layers. ThreatListPro works at the firewall perimeter using global honeypot intelligence to block known attackers before they send a single packet to your VPN portal. Fail2ban works on the server itself, watching log files and banning IPs only after they have already generated failed login attempts. Understanding this distinction is the key to choosing the right tool — or deciding to use both.
Quick Comparison
| Feature | ThreatListPro | Fail2ban |
|---|---|---|
| Approach | Proactive (pre-block known attackers) | Reactive (ban after failed attempts) |
| Coverage | Global honeypot intelligence | Local server logs only |
| VPN-Specific | Yes, VPN brute force focused | Generic (SSH, web, email) |
| False Positives | Very low (curated) | Risk of banning legitimate users |
| Setup | EDL URL, 5-min setup | Server config, regex tuning |
| Maintenance | Zero (managed service) | Ongoing regex/config management |
| Multi-Firewall | Yes, any EDL-compatible firewall | Single server only |
| Pricing | $9.99/mo | Free |
When to Choose ThreatListPro
ThreatListPro is built for organizations that need to stop VPN brute force attacks before they happen. If any of the following describe your situation, it is the better choice.
- VPN brute force is your primary threat. You are seeing thousands of failed login attempts against GlobalProtect, SSL-VPN, AnyConnect, or another VPN portal. You need firewall-level blocking that stops attackers before they ever reach your VPN service — not a tool that reacts after the damage is underway.
- You need firewall-level blocking. Fail2ban operates on the server, meaning attack traffic has already reached your infrastructure. ThreatListPro blocks at the firewall perimeter, so malicious packets never touch your VPN appliance. This reduces load on your VPN concentrator and eliminates account lockout events.
- You manage multiple sites or clients. MSPs and MSSPs need a single, consistent feed they can deploy across dozens of customer firewalls. One ThreatListPro subscription covers all of them through a shared EDL URL. Fail2ban requires per-server installation and configuration.
- You want zero ongoing maintenance. ThreatListPro is a managed service. The list is curated, updated, and hosted for you. No regex filters to write, no jails to configure, no log parsers to debug when a service updates its log format.
When Fail2ban Might Be Enough
Fail2ban is a well-established, widely deployed tool with over 15 years of community development. It is the right choice in certain scenarios.
- You run a single Linux server. If your entire infrastructure is one server running SSH and a web application, Fail2ban is simple to install and effective at banning IPs that repeatedly fail to authenticate.
- SSH brute force is your main concern. Fail2ban's SSH jail works well out of the box with minimal configuration. It was originally designed for this exact use case and handles it effectively.
- Your budget is truly zero. If you have no budget for security tooling, Fail2ban is free, open-source, and functional. A reactive defense is better than no defense at all.
- You are comfortable with regex and log parsing. Fail2ban requires writing or tuning regular expressions to match log patterns for each service you want to protect. If you have the skills and time for this, it offers flexible, customizable protection.
The Key Difference: Proactive vs Reactive
This is the fundamental distinction between the two tools, and it matters most for VPN portal protection.
ThreatListPro: Block before the first attempt
ThreatListPro sources its blocklist from honeypots that mimic real VPN portals — GlobalProtect, SSL-VPN, AnyConnect, and others. When an attacker hits a honeypot, their IP is verified, curated, and added to the blocklist. Your firewall fetches this list and drops traffic from those IPs before they ever reach your real VPN portal. Zero failed login attempts. Zero account lockouts. Zero log noise.
Fail2ban: Ban after the damage starts
Fail2ban watches your server's log files for patterns matching failed login attempts. After a configurable number of failures (typically 3-5), it adds a temporary firewall rule to ban the offending IP. This means the attacker has already generated failed login events, potentially triggered account lockouts, consumed VPN concentrator resources, and created log noise for your SOC to investigate — all before Fail2ban kicks in.
EDL URL: https://api.threatlistpro.com/v1/blocklist?key=YOUR_KEY
# Fail2ban: install, configure jails, tune regex per service
$ apt install fail2ban
$ cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
$ vim /etc/fail2ban/jail.local # configure jails, ban times, retries
$ vim /etc/fail2ban/filter.d/my-vpn.conf # write custom regex
$ systemctl restart fail2ban
Can You Use Both Together?
Yes — and it is a recommended defense-in-depth strategy. The two tools operate at different layers and complement each other well.
- ThreatListPro at the firewall perimeter. Block the ~1,600 known VPN brute force attackers before they reach any of your internal services. This eliminates the bulk of automated attack traffic.
- Fail2ban on the server. Catch novel attackers that are not yet in any blocklist. If a new IP starts brute forcing your VPN and has not been seen by ThreatListPro's honeypots yet, Fail2ban provides a safety net by banning them after a few failed attempts.
This layered approach gives you both proactive intelligence and reactive fallback. ThreatListPro handles the known threats; Fail2ban handles the unknown ones that slip through.
Frequently Asked Questions
Is Fail2ban a good alternative to ThreatListPro?
They take different approaches. Fail2ban is a reactive, server-level tool that monitors log files and bans IPs after repeated failed login attempts. ThreatListPro is a proactive blocklist that works at the firewall level, blocking known VPN brute force attackers before they ever reach your server. If your primary concern is VPN brute force protection across all firewalled services with zero maintenance, ThreatListPro is the better fit.
Can I use Fail2ban and ThreatListPro together?
Yes, and it is a recommended defense-in-depth strategy. ThreatListPro catches known attackers at the firewall perimeter before they reach your servers. Fail2ban acts as a second layer on the server itself, catching novel attackers that slip through the perimeter. Together they provide both proactive and reactive protection.
Why use a paid blocklist when Fail2ban is free?
Fail2ban requires installation, jail configuration, regex filter tuning, and ongoing maintenance on every server you want to protect. It only blocks attackers after they have already attempted to log in. ThreatListPro is a single EDL URL that works across all your firewalls with zero maintenance, blocking known attackers before the first login attempt. The real cost comparison should include the admin time spent configuring and maintaining Fail2ban across multiple servers versus a plug-and-play service at $9.99/month.