I'm using BM 3.8 sp5 ir1 on NW 6.5sp5 cpr with Craig's proxy.cfg v29

A user is trying to access a secured site. This site requires a
special certificate to be installed on the specific computer as well
as the proper user login credentials. After logging to the site OK,
then going trying to go to:

(a tab on the main page)
The little status bar at the bottom of IE6 gets part way through and
after a very long time gives the "page can't be found" error.

If I bypass the proxy, the page loads very quickly with no problems.

I cleared the IE cache and cookies, cleared the BM cache (unload
proxy, proxy -cc), re-started the server, but the problem persists.

Any other suggestions you may have are welcome.