My exchange organisation is using FE/BE configuration, in the ratio of 1:1. Inbound mail if ok from FE and BE. The problem is http or https packets, meant for OWA can't be redirected to BE. When I rebooted both servers, they shown me a red marks on "Exchange", "Exchadmin" and "Public" in IIS 5.0. After I restarted all the msexchange services, everything looks working perfectly. Any advice is appreciated!!!