Hi!
I have installed an Exchange 2013 beside an already running Exchange 2010.
I can login into the 2013 ECP without problems.
But if I want to login into OWA 2013 I am coming back to the login page without any errors. There are no errors in the event log of the Exchange 2013 server.
So without any error I'm running out of ideas what is going wrong. So hopefully someone can give me a hint what is going on or what I can do...