How to use "Proxy Host" and "Proxy Port" on the Portal Access Setting

Hi,

Can you please let me know how to use "Proxy Host" and "Proxy Port" options on the Portal Access setting.

Only port 80 can use Proxy?

[Case1] * work fine.

Application URI - http://www.test.com/

Proxy Host - proxy.test.com

Proxy Port - 8080

Resource Item - Hostname:*, Paths:/*, Port:80

[Case2] * work NOT fine. (It does NOT access to the Proxy)

Application URI - http://www.test.com:50000/

Proxy Host - proxy.test.com

Proxy Port - 8080

Resource Item - Hostname:*, Paths:/*, Port:50000

Regards,