Is the Mac logging into the Novell network? I was under the impression that the user needed to be authenticated through the Novell network for access to the BorderManager proxy. Some networks may require a client app to hook into the internet.
I would consider looking to Safari instead of IE. IE has just been announced as a dead product on the Mac. While you may be using IE for 'compatibility' reasons, in a few months, another bug will be found with no support to fix it. It may be wise to switch to a browser that is still alive.
- - picklefish - -