Forefront Threat Management Gateway (TMG) is a multi-layered perimeter defense system. It’s a network security and protection solution from Microsoft, which they describe as « enables businesses by allowing employees to safely and productively use the Internet for business without worrying about malware and other threats. It’s an enterprise-class firewall with advanced web protection features such as URL filtering, gateway-integrated virus and malicious software scanning, network intrusion detection and prevention, and outbound HTTPS inspection, Forefront TMG provides exceptional protection from advanced, persistent threats. It also provides secure remote access to internal networks and applications and can serve as a consolidated secure mail relay.