Microsoft Forefront Threat Management Gateway (Forefront TMG), formerly known as Microsoft Internet Security and Acceleration Server (ISA Server), is a network router, firewall, antivirus program, VPN server and web cache from Microsoft Corporation.
Forefront TMG is a Multilayer Enterprise Firewall with several features:
- Stateful Packet filtering.
- Application Layer Firewalling.
- HTTP Filter.
- HTTPS Inspection.
- URL Filtering.
- Malware Inspection.
- VPN Server (Client VPN and Site to Site VPN)
- Web proxy and Web caching Server.