Exchange 2013 Cu3 Unable to get ECP or OWA working.

Hello, 

I'm expirencing difficulties with exchange 2013 CU3, I installed two exchange 2013 servers one for the mailbox role and the other for CAS. After that I upgraded to CU3 and with the default configuration I cannot access the ECP or OWA. 

I can access the Exchange managment shell.

I get a blank page with the url: https://CAS.Domain.local/ecp/login.aspx?ReturnUrl=%2fecp

Edit: 

After setting the authentication parametres in IIS to the default values I am instead redirected to a blank page with the following url: https://CAS.Domain.local/owa/languageselection.aspx?url=%2fecp%2fdefault.aspx