FrontPage 2002 through MS Proxy.

I had FrontPage 2000 and 2002 on Win98 working through MS Proxy server without a problem. I got a new machine win2k and added fp 2002. Now it won’t open, save or edit a page on the hosted web server. error code is authorization required, browser doesn’t understand how to supply credentials required. I think it has to new with new ms security feature in w2k. Any ideas?