HP Wireless Controller Guest access using Proxy

[techies-support]

I have configured a 60 AP network using a HP MSM760. I have set up a GUEST SSID and land the user on a page to login. Unfortunately on the WIFI device the user has to configure PROXY server and Port to enable them to browse. Has anyone set this up on a HP controller whereby any user on GUEST SSID get redirected to the upstream PROXY on the educational WAN