When you set Symantec Web Gateway (SWG) Appliance to Proxy mode and browse the internet, you notice that SWG presents a blocking page for IP addresses which have a whitelist entry. You seek steps to prevent SWG in proxy mode from blocking pages which you would otherwise seek to whitelist.
SWG Proxy mode does not support whitelist IP for proxy traffic including client IP and server IP.
To white list any server, use a PAC file.
To white list any client machine, do not configure client browser to use SWG proxy service.