Working on it here:
http://forum.ebox-platform.com/index.php?topic=4702.0Got bit by this too; I'm working on a solution.
New Zentyal RC2 behavior is:
Local accounts on the zentyal machine in the 'admin' group are allowed to log into ebox's UI.
Solution: create a local account and add it to the admin group (creating the admin group first if nonexistant) and use it's shell password to login.
I'm still figuring out how to do the same with *no* local account (LDAP+PAM only) in the above thread.
Using the Zentyal installer will create such a local user in the admin group as part of the install process.
Installing manually from PPA will *not*.