by Alan Hare.
Osajus,
You want to reference these previous posts for troubleshooting tips on your issue:
https://moodle.org/mod/forum/discuss.php?d=163035
http://docs.moodle.org/20/en/LDAP_authentication
http://docs.moodle.org/23/en/LDAP_enrolment
If you have further questions after your review of those posts and documents then I mya be able to assist. Please include your web server system configuration and your moodle version.
Regards,
Alan