Weblogic - iPlanet LDAP problems

I am using WLS 8.1 SP3 on a Solaris box with JDK 1.4.1_05. We are using the perimiter authentication in WLS. All the web resources of the application (*.jsp) are protected using a Form based authentication. When a resource is invoked, Weblogic determines if the person has signed on to the app, if not, it throws a login page to the user. The problem we seem to have is that the Weblogic does not seem to disconnect the connections once the authentication process is complete. i.e. When we run a netstat on the LDAP box, the connections from the Weblogic server is always 'ESTABLISHED' and it never seems to time out. I have scoured the documentation looking for a setting that would force WLS to disconnect either after a successful or a failed auth. Has anyone else experienced such a problem ? Is there a patch for this ?

Thanks in advance
Pradeep Ram