When downloading files thru the proxy using Windows XP(sp1) or Windows

2000(sp1,2,3), downloads start off quick but then slow, get jumpy
seems to burst in and then stop), and then stops altogether.

This happens on almost every win2k/winxp on my network - including
just built last week with Client 4.9 and all the latest Microsoft
patches. This has been an ongoing problem but I've only recently
how widespread it is.

My BorderManager server is running 3.7sp1 and netware 6.0sp2.

When I configure a machine to NOT use the proxy but open up a filter
it, it seems to download normally.

Any ideas??