I've recently installed a test instance of 7.7 enterprise on Ubuntu server 14.04 php v 5.5. I've got ldap enabled and configured. I'm 99% sure all is right because I have other applications successfully using the same credentials and configs. It mostly looks like Sugar isn't even trying to use the LDAP login.
I've also followed the steps here http://support.sugarcrm.com/Knowledge_Base/Administration/Password_Management/Configuring_LDAP_Authentication_Using_Acti…
The logs show that the auth fails but it doesn't give the normal auth error for an ldap failure just that user authentication failed. I'm tailing apache access and error logs as well as Sugar log. Only Sugar log shows any errors.