If your Active Directory domain controllers are configured with their "Domain Controller: LDAP server signing requirements" group policy set to "Require signing".
This patch modifies the behaviour of LDAP connections from VSJ to match the SASL "auth-int" quality of protection that Active Directory expects when its group policy is set to "Require signing".
Download the hotfix called, QSJ WebLogic Edition 3.2 (Patch_3532) Software for Solution SOL55945 from: https://support.quest.com/SUPPORT/index?page=downloadsentitlement&file=2780298
Issue resolved in Hotfix
Use SASL "auth-int" to support AD "Require Signing" policy