2013 exchange ecp incorrect username and password

Hi-

I run 2012R2 server as DC and Hyperv 2012 server with Exchange 2013 SP1.

All installations are carried our without errors and I try to log on to https://localhost/ecp. I get the Exchange Admin login and when I type dom\Administrator and the password I get -

The typed username or the typed password is not correct. Try again.