It sounds as if mail1.domain.com isn't configured as a front-end server.
Did you check the checkbox in ESM to make it a front-end server? If so, did
you leave the System Attendant running to allow it to propogate all the new
settings from the AD onto the local machine? If you need general
instructions on how to configure a front-end/back-end topology there is a
good paper here:
Once you have correctly configured your front-end server the double
authentication should go away along with the redirection.
> I'm trying to configure an OWA Front End to work with my 2 Exchange
> I have no problem connecting to the local exchange using
> mail1.domain.com/exchange, although it asks for login twice. I can't
> to a remote exchange server on a different subnet.
> On mail1.domain.com, it also redirects the address in the browser to the
> real exchange servers name, is this normal?