Secure Communication between Client Proxy and Secure Web Gateway
You can enable the Secure Channel option to establish a secure communication channel between Client Proxy and Secure Web Gateway for all HTTP/HTTPS requests. When you enable this option, the software validates the cloud proxy certificate against the device certificate store and establishes a secure connection.
When you enable Secure Channel, Client Proxy uses the 8081 port to check captive portals and cloud proxy connections. But, you continue to configure the 8080 port and proxy server hostname when adding a cloud proxy server.