• Secure web gateway deployments
• Internet traffic filtering
• Content filtering and URL control
• SSL traffic inspection
• WAN optimization
• Branch office security
• Enterprise internet access control
• User authentication and policy enforcement
• Network performance optimization
• Corporate cybersecurity environments
• Educational and government networks

The S400 series was designed as a mid-range appliance within the Blue Coat ProxySG family for enterprise and branch office deployments.

The Blue Coat ProxySG S400 is a secure web gateway appliance designed for enterprise web filtering, SSL inspection, access control, and WAN optimization. Running Blue Coat SGOS, it provides policy-based internet access management, user authentication, bandwidth control, and traffic visibility for branch offices and enterprise networks. The S400 supports centralized administration, high-availability deployments, and advanced web security features, making it suitable for organizations requiring secure and optimized internet connectivity.