Siebel System Requirements and Supported Platforms > Hardware and Network Requirements > Server Network Requirements >

Firewall Proxy/Reverse Proxy Support

Firewall proxies and reverse proxies implemented in conjunction with Siebel applications is supported with HTTP 1.0 or 1.1 protocol. Special deployment considerations should be made when using proxies that support HTTP 1.0. For more information, see the section about installing the Siebel Web Server Extension in the Siebel Installation Guide for the operating system you are using.