To troubleshoot Active Directory LDAP filter issues, follow the steps below:

1. Ensure that the correct credentials are being used by checking the LDAP filter settings.


2. Run security ring hotspot or port scanning to ensure that the LDAP server is online and is not blocked by firewall.


3. Ensure that the ports being used are open and not blocked.


4. Disable or enable the LDAP over SSL (LDAPS) protocol based on the firewall.


5. Check if the secure directory permission has been applied correctly.


6. Test the LDAP filter settings using a secure LDAP browser.


7. Verify the LDAP filter syntax.


8. Correct any configuration problems and test again.