Trusted Authentication in XI 3.1

We are trying to configure Trusted Authentication and single sign-on for BO XI 3.1 on AIX with WebSphere 6.1 using HTTP headers or cookies to retrieve the user name. We cannot get this to work. We follow the steps in the Administrator's Guide (Chapter 4), but still cannot get it to work.                                                                               

We receive the following message:                                                                               

Account Information Not Recognized: The secLDAP security plugin is not enabled. Contact your system administrator for details. (FWB 00002)                                                                

The log file shows the following:                                                                               

<log4j:event                                                                               

logger="com.crystaldecisions.sdk.plugin.authentication.ldap.internal.LDAPImpl" timestamp="1234210285961" level="ERROR" thread="WebContainer :1">                                                                               

<log4j:message><![CDATA[LogonUser(): secldap not available]]                                                                       

></log4j:message>                                                                               

</log4j:event>

Could you please let me know how to find trusted.auth.user.param value and the steps required to configure trusted authentication in XI 3.1 using HTTP_header/cookies?

Thanks in advance

V