If i go to https://10.x.x.x/exchange directly, i get prompted for my basic auth login, and then OWA works fine. However, if i set up a forms based web listener, and then publish a rule to https://10.x.x.x/exchange, i have to login at the forms page, and then OWA loads, and asks for authentication when it tries loading the first message.
Any idea here? It does this as well when i publish RPC over http via ISA too.