Flexible-client SOCKS support means that the Caching Proxy does not forward all requests to the SOCKS server. You can specify which requests (based on their IP addresses or domains) are routed to the SOCKS server and which requests are routed directly to destination content servers. (See Direct Connections for more information about routing requests directly to origin servers.)
If your system does not have a SOCKS configuration file when the Caching Proxy is installed, a default SOCKS configuration file is installed. This file contains comments and instructions.
Note: For help with configuring SOCKS connections, you might need to consult your network administrator.