Proxy 2/Exchange 2000/OWA

I have proxy server set up on a win 2000 server and exchange 2000 on a second server. OWA installs as default and works fine internally. I have enabled web publishing on proxy purely for OWA users to access from outside. HTTP is enabled as a serviceon proxy. I have included a forward on web proxy for all requests to http://ip address of extl proxy card/exchange to be redirected to http://exchange server/exchange —- however, if I test the connection the re-direct doesn’t work and the defaultwebsite comes up.

???suggestions gratefully received