AiP Defense is described as 'Your Microsoft Windows servers are probably under constant attack and you may not even know it! Chances are if your hosting remote desktop, or other services such as Microsoft exchange, FTP, HTTP, HTTP’s or SQL. Your server is likely getting bombarded with failed login attempts' and is a Firewall in the security & privacy category. There are more than 10 alternatives to AiP Defense for Windows, Linux, Web-based and Self-Hosted. The best AiP Defense alternative is Fail2ban, which is both free and Open Source. Other great apps like AiP Defense are IPBanPro, Denyhosts, RdpGuard and SpyLog.