SSHGuard

SSHGuard monitors services through their logging activity. It reacts to messages about dangerous activity by blocking the source address with the local firewall.

Free Open Source Mac OS X Linux

Fail2ban

Fail2ban scans log files (e.g. /var/log/apache/error_log) and bans IPs that show the malicious signs -- too many password failures, seeking for exploits, etc.

Free Open Source Linux

Denyhosts

The idea of denying access to SSH servers is nothing new and I was inspired by many other scripts that I discovered. However, none of them did things the way I envisioned them to.

Free Open Source Linux

RdpGuard

RdpGuard allows you to protect your Remote Desktop (RDP) from brute-force attacks by blocking attacker's IP address. Fail2Ban for Windows.

Commercial Windows

IPQ BDB

IPQ BDB filtering is done by a user space netfilter daemon that issues verdicts after looking up the IP address in a Berkeley DB. The fuzzy blocking model, freely...

Free Open Source Linux

IPBan

A FREE and open source application that allows banning ip addresses from failed terminal services or SQL server logins out of the box. Other types of banning are easily...

Free Open Source Windows

SpyLog

Monitor logs from several sources and execute actions based on some rules. Can be used to protecet against brute-force attacks.

Free Open Source Windows

Cyberarms Intrusion Detection and Defense System (IDDS)

Windows Server brute force protection for Remote Desktop (including NLA), FTP, SMTP, and much more.

Free Open Source Windows

Syspeace

An autoblocker for brute force attacks primarily for Windows Servers with good information in the admin mils telling you DNS names, country of origin and username used...

Commercial Windows

Anti DDoS Guardian

Stops RDP Brute force attack as well as DDoS agaist IIS, FTP, SMTP, and several more.

Commercial Windows