Using BM 3.5 sp3, netware 5.1 sp4.
I encountered "Novell BorderManager Alert, 403 forbidden" message when
tried
to login to hotmail.com, download drivers from HP website. But no
problem
downloading from Novell.com, microsoft.com & symantec.com? In the
'Internet
Options' setting of IE, under 'proxy server' i keyin the IP address of
the
BM & port 8080.

We did not use SSL or SSO for authentication.
In the Access Rules, there's only 2 actions,

Deny - Specified IP range - HTTP proxy Any
Allow - Any - HTTP proxy Any