Harden-It 1.10 Windows Security Hardening Tool harden your TCP/IP Stack and Local System. Harden-It is a Network and System hardening tool for Windows, by hardening the IP stack your Network can sustain or completely twarth various sophisticated network attacks. · Harden your server`s TCP and IP stack · Protect your servers from Denial of Service and other network based attacks· Enable SYN flood protection when an attack is detected