I'm trying to get a Cisco IPS to download updates using a Bordermanager box
and according to Cisco tech support the IPS is unable to download the
updates because Proxy Redirection is not working on the Bordermanager

I checked the BM server but I couldn't figure out how to configure proxy
redirection. Can you tell me how to enable proxy redirection?

The IPS from what I can tell is a linux box.