NetWare 6.0 SP5, eDirectory, BorderManager 3.7 Field Patch 4D

ISP changed there authenticating servers recently, now, constantly have to
re-authenticate in Internet Explorer. If bypass the proxy, we don't have
to, if using Mozilla Firefox 1.0.4 via proxy, I don't have to re-
authenticate. Am using Craig Johnson's rev.20 proxy.cfg file. Any help
would be appreciated as ISP is no help.