Exchange 2013: 404 Error when accessing the Exchange Admin Center(EAC)

Scenario:

Exchange 2013 CAS role installs perfectly, after a reboot when you open the Exchange Admin Center you are presented with the login screen however once you enter in your admin account details you receive the HTTP 404 error as shown below:

Solution:

The reason is because no Exchange 2013 Mailbox role is installed. Once you install a mailbox server you will be able to access the Exchange Admin Center.

Hope it helps.