LDAP lookups fail
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 or port 636
If you are using SSL, then use port 636. Otherwise, use port 389.
Make sure that the LDAP server address contains the host name, not the IP address
For more information, see Configuring LDAP network account settings.
If the LDAP server requires SSL, then make sure that the correct SSL settings are used
For more information, see Configuring LDAP network account settings.
Narrow the LDAP search base to the lowest possible scope that includes all necessary users
Make sure that all LDAP search attributes are correct
Contact your system administrator