The Glasswall Halo ICAP server can be configured with any ICAP-enabled network security appliance, which includes firewalls, VPNs, proxies, gateways and load balancers.
Firewalls
ICAP Server Integration
For a complete step-by-step process of settting up the Glasswall Halo ICAP server, please refer to the ICAP Server Integration guide.