ISA Server contains a full featured, application-layer aware firewall that helps protect organisations of all sizes from attack by both external and internal threats.
ISA Server performs deep inspection of Internet protocols such as Hypertext Transfer Protocol (HTTP), which enables it to detect many threats that traditional firewalls cannot detect. The integrated firewall and VPN architecture of ISA Server support filtering and inspection of all VPN traffic.
The firewall also provides VPN client inspection for Microsoft Windows Server 2003-based quarantine solutions, helping to protect networks from attacks that enter through a VPN connection.
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