post your configuration file.
in config.php, please add in the auth_method 3=>ldap as shown in the example in the file. This will allow you to use LDAP. I have not tested them in a long time. SLDAP should work too. I uploaded a new version on tac_plus. Please use this one. It fixes a problem with Fortinet firewalls.
Please upgrade the latest versions which I just uploaded. Let me know if the problem still exists. If still exists, turn on debug 255 and send me logs - baram01@hotmail.com.