Enhanced Authentication Feedback introduced since v10.1 is a NetScaler option disabled by default which provides more information to the end user about the reason for an authentication failure. By default when a user authenticates to as an example NetScaler Gateway and fails, the Incorrect user name or password message returned is the only reason NetScaler will give.
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ldap
Configuring LDAPS on Citrix NetScaler
If you want to enable LDAP Secure for NetScaler authentication follow the below guide. Using LDAPS allows you to use the Allow password change option on NetScaler so Active Directory users can change their expired passwords. For this reason, and the security advantage, many people opt in to using LDAPS with NetScaler.