I have a single AD domain with 3 sites and a single post office. I set up a fourth exchange server at the primary site and set it as a AFront-end server. When I try to access OWA I get page not found. I can successfully access OWa directly from the back-end servers. I have installed SP1 for W2K3 Server and SP2 for Exchange. Mail works fine internally. Insight into this issue would be greatly appreciated.