Try one or more of the following:
Make sure that the server and firewall settings are configured to allow communication between the printer and the LDAP server on Port 389 and Port 636.
From the Embedded Web Server, click Settings or Configuration.
Click Network/Ports > Address Book Setup.
Make sure that the host name (not the IP address) of the LDAP server appears in the Server Address field.
Apply the changes.
From the Embedded Web Server, click Settings or Configuration.
Click Network/Ports > Address Book Setup.
Check the following settings:
Server Port—Set to 636.
Use SSL/TLS—Select SSL/TLS.
LDAP Certificate Verification—Select Never.
Apply the changes.
Make sure that all LDAP attributes for the user are correct.