This article examines the differences between the Solaris 8 Operating Environment (Solaris OE) Lightweight Directory Access Protocol (LDAP) Client and the Solaris 9 OE Secured LDAP Client, and explains how to support them on the same directory server. In addition, this article details troubleshooting tips for common implementation problems.Also, this article provides recommendations on how to secure a Solaris Operating Environment (Solaris OE). Securing a Solaris OE system requires that changes be made to its default configuration. The changes outlined in this article address the majority of the methods that intruders use to gain unauthorized or privileged access to an improperly configured system. Implementing the changes recommended in this article requires planning, testing, and documentation to be successful in securing a computing environment.