RainWall brings fault tolerance to your ISA Server configured in the firewall or integrated mode, and addresses NLB limitations. RainWall software installs on an existing ISA Server (Standard and Enterprise Editions) and clusters multiple ISA Servers to act as a single gateway. RainWall enables your ISA Server to be non-stop, fast, and scalable. RainWall guarantees packet delivery and connection integrity even when load balancing ISA Servers in environments with secure server publishing and VPN. RainWall allows clustering multiple network interfaces and manages bi-directional traffic. RainWall monitors ISA Server service, system, and network availability for automatic fail-over, and dynamically balances the ISA Server workload in the cluster by distributing connections to the least busy node. RainWall, when used with Rainfinity's RainConnect for non-stop Internet access, offers a total solution that extends high availability to your critical security and Internet resources.