I have a server running SBS2000. On this same server I am running ISA2000 and Exchange2000. ISA is listening on port 80, IIS on a different port. All my websites are redirected through ISA through Destionation-sets and Web Publishing Rules. This all works fine.
Now I have done the same for Exchange (which is in the Default Web Site), so I could use OWA (only HTTP, no HTTPS/SSL etc., just to be able to get it working). When I try to connect to it through my internal network, it is running fine, no problems.
However, trying to connect from outside always gives me the same error. I type in "http://myexchange.mydomain.com/exchange/username" (exactly the same URL as on my local network), an authentication-popup appears. After filling in my credentials the browser clears, then the vertical bar appears, which separates the boxes on the left side from whats in the boxes on the right. Then for about 15 secs. the browser says "connecting to site MyIP". Then it displays the message "The page cannot be displayed" I tried all kind of solutions I found on the Internet, playing with Anonymous/Basic authentication, nothing.
When I leave out the Web publising Rule, and set IIS to listen on port 80 again, I can access OWA also from external. But of course I don't wan't IIS to listen on port 80!!!
Any clues ??