Access Manager 7 2005Q4 was released with LDAP JDK 4.18 as part of the Java ES 2005Q4 release, which resulted in a number of Access Manager and Directory Server connection problems.
Workaround: Apply one of the following Sun Java System LDAP Java Development Kit patches:
Solaris OS, SPARC and x86 platforms: 119725-04
Linux OS: 120834-02
The patches are available on SunSolve Online: http://sunsolve.sun.com.