When attempting to set up LDAP for the first time, the variable UC_LDAP_EXAMPLE should be used as a template for configuring your LDAP connections. When completely filled out, however, no users are able to be synced and no information about the user is populated from the LDAP server in the User object.
Extra character in the UC_LDAP_* variable in the DOMAIN_ALIAS Key.
When checking over the LDAP variable, nothing immediately stands out:
Upon further investigation, however, when you edit the variable a new character will present to the right of the Value, such as in the example below for DOMAIN_ALIAS:
Open the Cell Editor view via the box to the right of the Value (as in the above picture) - a new dialog should now show:
Remove this extra space, click OK, and save the variable. You should now be able to synchronize your users.