Hi,
LDAP users are not synced, please find the log for more details.
Note: Tested the configuration in LDAP browser exe application, it's working fine and fetched all users and groups.
2017-11-10 19:45:09,719 INFO [org.alfresco.repo.security.sync.ChainingUserRegistrySynchronizer] [localhost-startStop-1] Synchronizing users and groups with user registry 'ldap4'
2017-11-10 19:45:09,745 INFO [org.alfresco.repo.security.sync.ChainingUserRegistrySynchronizer] [localhost-startStop-1] Retrieving all groups from user registry 'ldap4'
2017-11-10 19:45:11,019 INFO [org.alfresco.repo.security.sync.ChainingUserRegistrySynchronizer] [localhost-startStop-1] Synchronization,Category=directory,id1=ldap4,id2=1 Group Analysis: Commencing batch of 0 entries
2017-11-10 19:45:11,019 INFO [org.alfresco.repo.security.sync.ChainingUserRegistrySynchronizer] [localhost-startStop-1] Synchronization,Category=directory,id1=ldap4,id2=1 Group Analysis: Completed batch of 0 entries
2017-11-10 19:45:11,023 INFO [org.alfresco.repo.security.sync.ChainingUserRegistrySynchronizer] [localhost-startStop-1] Retrieving all users from user registry 'ldap4'
2017-11-10 19:45:11,278 INFO [org.alfresco.repo.security.sync.ChainingUserRegistrySynchronizer] [localhost-startStop-1] Synchronization,Category=directory,id1=ldap4,id2=6 User Creation and Association: Commencing batch of 0 entries
2017-11-10 19:45:11,279 INFO [org.alfresco.repo.security.sync.ChainingUserRegistrySynchronizer] [localhost-startStop-1] Synchronization,Category=directory,id1=ldap4,id2=6 User Creation and Association: Completed batch of 0 entries
2017-11-10 19:45:11,279 INFO [org.alfresco.repo.security.sync.ChainingUserRegistrySynchronizer] [localhost-startStop-1] Finished synchronizing users and groups with user registry 'ldap4'
2017-11-10 19:45:11,279 INFO [org.alfresco.repo.security.sync.ChainingUserRegistrySynchronizer] [localhost-startStop-1] 0 user(s) and 0 group(s) processed